Unsaturated nitrogen heterocyclic compounds useful as PDE10 inhibitors

ABSTRACT

Unsaturated nitrogen heterocyclic compounds of formula (I): 
                         
as defined in the specification, compositions containing them, and processes for preparing such compounds. Provided herein also are methods of treating disorders or diseases treatable by inhibition of PDE10, such as obesity, Huntington&#39;s Disease, non-insulin dependent diabetes, schizophrenia, bipolar disorder, obsessive-compulsive disorder, and the like.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No. 61/334,525, filed May 13, 2010, which is hereby incorporated by reference.

FIELD OF THE INVENTION

Provided herein are certain unsaturated nitrogen heterocyclic compounds that are PDE10 inhibitors, pharmaceutical compositions containing such compounds, and processes for preparing such compounds. Provided herein also are methods of treating disorders or diseases treatable by inhibition of PDE10, such as obesity, Huntington's disease, non-insulin dependent diabetes, schizophrenia, bipolar disorder, obsessive-compulsive disorder, and the like.

BACKGROUND

Neurotransmitters and hormones, as well as other types of extracellular signals such as light and odors, create intracellular signals by altering the amounts of cyclic nucleotide monophosphates (cAMP and cGMP) within cells. These intracellular messengers alter the functions of many intracellular proteins. Cyclic AMP regulates the activity of cAMP-dependent protein kinase (PKA). PKA phosphorylates and regulates the function of many types of proteins, including ion channels, enzymes, and transcription factors. Downstream mediators of cGMP signaling also include kinases and ion channels. In addition to actions mediated by kinases, cAMP and cGMP bind directly to some cell proteins and directly regulate their activities.

Cyclic nucleotides are produced from the actions of adenylyl cyclase and guanylyl cyclase, which convert ATP to cAMP and GTP to cGMP. Extracellular signals, often through the actions of G protein-coupled receptors, regulate the activities of the cyclases. Alternatively, the amount of cAMP and cGMP may be altered by regulating the activities of the enzymes that degrade cyclic nucleotides. Cell homeostasis is maintained by the rapid degradation of cyclic nucleotides after stimulus-induced increases. The enzymes that degrade cyclic nucleotides are called 3′,5′-cyclic nucleotide-specific phosphodiesterases (PDEs).

Eleven PDE gene families (PDE1-PDE11) have been identified based on their distinct amino acid sequences, catalytic and regulatory characteristics, and sensitivity to small molecule inhibitors. These families are coded for by 21 genes; and further multiple splice variants are transcribed from many of these genes. Expression patterns of each of the gene families are distinct. PDEs differ with respect to their affinity for cAMP and cGMP. Activities of different PDEs are regulated by different signals. For example, PDE1 is stimulated by Ca²⁺/calmodulin. PDE2 activity is stimulated by cGMP. PDE3 is inhibited by cGMP. PDE4 is cAMP specific and is specifically inhibited by rolipram. PDE5 is cGMP-specific. PDE6 is expressed in retina.

PDE10 sequences were identified by using bioinformatics and sequence information from other PDE gene families (Fujishige et al., J. Biol. Chem. 274:18438-18445, 1999; Loughney et al., Gene 234:109-117, 1999; Soderling et al., Proc. Natl. Acad. Sci. USA 96:7071-7076, 1999). The PDE10 gene family is distinguished based on its amino acid sequence, functional properties and tissue distribution. The human PDE10 gene is large, over 200 kilobases, with up to 24 exons coding for each of the splice variants. The amino acid sequence is characterized by two GAF domains (which bind cGMP), a catalytic region, and alternatively spliced N and C termini. Numerous splice variants are possible because at least three alternative exons encode N termini and two exons encode C-termini. PDE10A1 is a 779 amino acid protein that hydrolyzes both cAMP and cGMP. The K_(m) values for cAMP and cGMP are 0.05 and 3.0 micromolar, respectively. In addition to human variants, several variants with high homology have been isolated from both rat and mouse tissues and sequence banks.

PDE10 RNA transcripts were initially detected in human testis and brain. Subsequent immunohistochemical analysis revealed that the highest levels of PDE10 are expressed in the basal ganglia. Specifically, striatal neurons in the olfactory tubercle, caudate nucleus and nucleus accumbens are enriched in PDE10. Western blots did not reveal the expression of PDE10 in other brain tissues, although immunoprecipitation of the PDE10 complex was possible in hippocampal and cortical tissues. This suggests that the expression level of PDE10 in these other tissues is 100-fold less than in striatal neurons. Expression in hippocampus is limited to the cell bodies, whereas PDE10 is expressed in terminals, dendrites and axons of striatal neurons.

The tissue distribution of PDE10 indicates that PDE10 inhibitors can be used to raise levels of cAMP and/or cGMP within cells that express the PDE10 enzyme, for example, in neurons that comprise the basal ganglia and therefore would be useful in treating a variety of neuropsychiatric conditions involving the basal ganglia such as obesity, non-insulin dependent diabetes, schizophrenia, bipolar disorder, obsessive compulsive disorder, and the like.

Noninvasive, nuclear imaging techniques can be used to obtain basic and diagnostic information about the physiology and biochemistry of a variety of living subjects including experimental animals, normal humans and patients. These techniques rely on the use of sophisticated imaging instrumentation that is capable of detecting radiation emitted from radiotracers administered to such living subjects. The information obtained can be reconstructed to provide planar and tomographic images that reveal distribution of the radiotracer as a function of time. Use of appropriately designed radiotracers can result in images which contain information on the structure, function and most importantly, the physiology and biochemistry of the subject. Much of this information cannot be obtained by other means. The radiotracers used in these studies are designed to have defined behaviors in vivo which permit the determination of specific information concerning the physiology or biochemistry of the subject or the effects that various diseases or drugs have on the physiology or biochemistry of the subject. Currently, radiotracers are available for obtaining useful information concerning such things as cardiac function, myocardial blood flow, lung perfusion, liver function, brain blood flow, regional brain glucose and oxygen metabolism.

Compounds of the invention can be labeled with either positron or gamma emitting radionuclides. For imaging, the most commonly used positron emitting (PET) radionuclides are ¹¹C, ¹⁸F, ¹⁵O, ¹³N, ⁷⁶Br, ⁷⁷Br, ¹²³I, or ¹²⁵I, wherein ¹¹C, ¹⁸F, ¹²³I, or ¹²⁵I are preferred, all of which are accelerator produced. In the two decades, one of the most active areas of nuclear medicine research has been the development of receptor imaging radiotracers. These tracers bind with high affinity and specificity to selective receptors and neuroreceptors. For example, Johnson and Johnson has synthesized and evaluated ¹⁸F-JNJ41510417 as a selective and high-affinity radioligand for in vivo brain imaging of PDE10A using PET (The Journal Of Nuclear Medicine; Vol. 51; No. 10; October 2010).

SUMMARY OF THE INVENTION

The present invention comprises a new class of unsaturated nitrogen heterocyclic compounds useful in the treatment of diseases, such as PDE10-mediated diseases and other maladies, such as schizophrenia, Huntington's disease, bipolar disorder, or obsessive-compulsive disorder. Accordingly, the invention also comprises pharmaceutical compositions comprising the compounds, methods for the treatment of PDE10-mediated diseases and other maladies, such as schizophrenia, Huntington's disease, bipolar disorder, or obsessive-compulsive disorder, using the compounds and compositions of the invention, and intermediates and processes useful for the preparation of the compounds of the invention.

Another aspect of the invention comprises a new class of unsaturated nitrogen heterocyclic compounds radiolabeled with a positron emitting radionuclide selected from ¹¹C, ¹⁸F, ¹⁵O, ¹³N, ⁷⁶Br, ⁷⁷Br, ¹²³I, or ¹²⁵I, a radiopharmaceutical composition comprising the radiolabelled compound, a method for the diagnostic imaging of PDE10 receptors in a mammal, including human, or tissues bearing PDE10 receptors in a mammal, including human brain, which comprises administering to a mammal in need of such diagnostic imaging an effective amount of the radiolabeled compound, and a method for the detection or quantification of PDE10 receptors in mammalian tissue, including human tissue, which comprises contacting such mammalian tissue in which such detection or quantification is desired with an effective amount of the radiolabeled compound.

The compounds of the invention are represented by the following general structure:

or a pharmaceutically acceptable salt thereof, wherein m, p, q, R¹, R^(4a), R^(4b), R⁵, Y, X¹, X², X³, X⁴, and X⁵ are defined below.

The compounds of the invention are represented by the following general structure:

or a pharmaceutically acceptable salt thereof, wherein m, p, q, R^(4a), R^(4b), R⁵, Y, X¹, X², X³, and X⁴ are defined below.

The compounds of the invention are represented by the following general structure:

or a pharmaceutically acceptable salt thereof, wherein m, p, q, R¹, R², R³, R^(4a), R^(4b), R⁵, Y, and X¹ are defined below.

Other compounds of the invention are represented by the following general structure:

or a pharmaceutically acceptable salt thereof, wherein m, p, q, Ring D, R², R³, R^(4a), R^(4b), R⁵, Y, and X¹ are defined below.

DETAILED DESCRIPTION OF THE INVENTION

One aspect of the current invention relates to compounds having the general structure of formula (I):

or a pharmaceutically acceptable salt thereof, wherein:

X¹ is N or CR⁶;

X² is N or CR²;

X³ is N or CR³;

X⁴ is N or CR⁶;

X⁵ is N or CR⁶;

wherein 1 to 2 of X¹, X², X³, X⁴ and X⁵ are N;

R¹ is halo, C₁₋₈alk, C₁₋₄haloalk, —OR^(c), —N(R^(a))C(═O)R^(b), —C(═O)R^(a), —C(═O)R^(c), —C(═O)—R^(a), —NR^(a)R^(c), —N(R^(c))C(═O)R^(b), —N(R^(a))C(═O)R^(c), —C(═O)NR^(a)R^(b), —C(═O)NR^(a)R^(c), or C₀₋₄alk-L¹; wherein said C₁₋₈alk group is substituted by 0, 1, 2 or 3 groups which are halo, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk;

Y is a C₀₋₄alk, —C(═O), SO, or SO₂;

each R² and R³ is independently R¹, H, halo, CN, OH, —OC₁₋₄alk, C₁₋₄alk, C₁₋₄haloalk, —C₁₋₆alkOR^(a), —C(═O)C₁₋₄alk, —C(═O)NR^(a)R^(a), —C₀₋₄alkNH—C(═O)R^(a), or R^(c);

or alternatively the ring containing X¹, X², X³, X⁴ and X⁵ can be fused to ring A, ring B, or ring C; having the formula:

wherein said ring A, ring B, or ring C is a fused 4- to 6-membered-saturated, -partially saturated, or -unsaturated-carbocyclic or -heterocyclic ring containing 0, 1, 2, or 3 heteroatoms; and is substituted by 0, 1, or 2 R¹⁰ groups;

R^(4a) is H, OH, halo, C₁₋₄alk, or C₁₋₄haloalk;

R^(4b) is halo, CN, OH, OC₁₋₄alk, C₁₋₄alk, C₁₋₄haloalk, or oxo;

R⁵ is —C₁₋₆alkOR^(a), 5- to 6-membered heteroaryl, unsaturated 9- to 10-membered bicyclo-heterocyclic ring, or 11- to 15-membered tricyclo-heterocyclic ring; R⁵ ring is substituted by 0, 1, 2, 3, or 4 R⁸ groups;

R⁶ is independently R¹, H, halo, CN, OH, OC₁₋₄alk, C₁₋₄alk or C₁₋₄haloalk;

m is 0, 1, 2, 3, or 4;

each of p and q is independently 0, 1, 2, 3, 4, 5, or 6; wherein the sum of p and q is 2 to 6;

the ring containing p and q contains 0, 1, or 2 double bonds;

R^(a) is independently H or R^(b);

R^(b) is independently phenyl, benzyl, or C₁₋₆alk, wherein said phenyl, benzyl, and C₁₋₆alk are substituted by 0, 1, 2 or 3 substituents which are, independently, halo, C₁₋₄alk, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk;

R^(c) is C₀₋₄alk-L²;

each L¹ is independently a carbon-linked or nitrogen-linked saturated, partially-saturated or unsaturated 3-, 4-, 5-, 6-, or 7-membered monocyclic ring or a saturated, partially-saturated or unsaturated 6-, 7-, 8-, 9-, 10-, 11-, or 12-membered bicyclic ring, said ring contains 0, 1, 2, 3, or 4 N atoms and 0, 1, or 2 atoms which are O or S; L¹ is independently substituted by 0, 1, 2 or 3 R⁹ groups;

each L² is independently a carbon-linked or nitrogen-linked saturated, partially-saturated or unsaturated 3-, 4-, 5-, 6-, or 7-membered monocyclic ring or a saturated, partially-saturated or unsaturated 6-, 7-, 8-, 9-, 10-, 11-, or 12-membered bicyclic ring, said ring contains 0, 1, 2, 3, or 4 N atoms and 0, 1, or 2 atoms which are O or S; L² is independently substituted by 0, 1, 2 or 3 R¹¹ groups;

R⁸ is halo, CN, OH, OC₁₋₄alk, C₁₋₄alk, C₁₋₄haloalk, OC₁₋₄haloalk, —C(═O)R^(b), —C(═O)R^(c), —C(═O)NHR^(b), —C(═O)NHR^(c), —S(═O)₂R^(b), —S(═O)₂R^(c), —S(═O)₂NR^(a)R^(a), R^(b), R^(c), NO₂, OR^(b), or OR^(c);

R⁹ is halo, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —C(═O)NR^(a)R^(a), —C(═NR^(a))NR^(a)R^(a), —OC(═O)R^(b), —OC(═O)NR^(a)R^(a), —OC₁₋₆alkNR^(a)R^(a), —OC₁₋₆alkOR^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —S(═O)₂NR^(a)R^(a), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —N(R^(a))C(═O)NR^(a)R^(a), —N(R^(a))C(═NR^(a))NR^(a)R^(a), —N(R^(a))S(═O)₂R^(b), —N(R^(a))S(═O)₂NR^(a)R^(a), —NR^(a)C₁₋₆alkNR^(a)R^(a), —NR^(a)C₁₋₆alkOR^(a), —C₁₋₆alkNR^(a)R^(a), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c);

R¹⁰ is oxo, C₁₋₆alk, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk; and

R¹¹ is halo, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —C(═O)NR^(a)R^(a), —C(═NR^(a))NR^(a)R^(a), —OC(═O)R^(b), —OC(═O)NR^(a)R^(a), —OC₁₋₆alkNR^(a)R^(a), —OC₁₋₆alkOR^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —S(═O)₂NR^(a)R^(a), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —N(R^(a))C(═O)NR^(a)R^(a), —N(R^(a))C(═NR^(a))NR^(a)R^(a), —N(R^(a))S(═O)₂R^(b), —N(R^(a))S(═O)₂NR^(a)R^(a), —NR^(a)C₁₋₆alkNR^(a)R^(a), —NR^(a)C₁₋₆alkOR^(a), —C₁₋₆alkNR^(a)R^(a), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), or oxo.

In one embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, each of said Ring A, Ring B, and Ring C is a fused 4- to 6-membered-saturated, -partially saturated, or -unsaturated-carbocyclic which are fused phenyl, cyclobutyl, cyclopentyl, or cyclohexyl; said Ring A, Ring B, and Ring C is substituted by 0, 1, or 2 R¹⁰ groups which are oxo, C₁₋₆alk, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, each of said Ring A, Ring B, and Ring C is a fused 5-membered-saturated, -partially saturated, or -unsaturated-heterocyclic ring which are fused furanyl, thiophenyl, pyrrolyl, pyrrolinyl, pyrrolidinyl, dioxolanyl, oxazolyl, thiazolyl, isothiazolyl, imidazolyl, imidazolinyl, imidazolidinyl, pyrazolyl, pyrazolinyl, pyrazolidinyl, isoxazolyl, or isothiazolyl; said Ring A, Ring B, and Ring C is substituted by 0, 1, or 2 R¹⁰ groups which are oxo, C₁₋₆alk, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, each of said Ring A, Ring B, and Ring C is a fused 6-membered-saturated, -partially saturated, or -unsaturated-heterocyclic ring which are fused pyranyl, pyridinyl, piperidinyl, dioxanyl, morpholinyl, dithianyl, thiomorpholinyl, pyridazinyl, pyrazinyl, or piperazinyl; said Ring A, Ring B, and Ring C is substituted by 0, 1, or 2 R¹⁰ groups which are oxo, C₁₋₆alk, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, each of p and q is independently 1.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, each of p and q is independently 2.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the ring containing p and q contains 0 or 1 double bond.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, wherein the sum of p and q is 3; and the ring containing p and q contains 0 or 1 double bond.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R^(4b) is oxo and m is 1.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R⁵ is unsaturated 10-membered bicyclo-heterocyclic ring; wherein each R⁵ ring is substituted by 0, 1, or 2 R⁸ groups.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group

wherein each

is substituted by 0, 1, or 2 R¹⁰ groups.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, m is 1 or 2.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, m is 0.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ is —NR^(a)R^(c), —OR^(c) or —C₀₋₄alk-L¹.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, L¹ is a carbon-linked-saturated or partially-saturated 3-, 4-, 5-, 6-, or 7-membered monocyclic ring, wherein each said ring contains 0, 1, or 2 N atoms and 0 or 1 O atoms, and wherein each said L¹ is substituted by 0, 1 or 2 R⁹ groups which are F, Cl, Br, C₁₋₆alk, —OR^(a), CN, —C(═O)R^(b), C(═O)OR^(a), —C(═O)NR^(a)R^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c).

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, L¹ is a carbon-linked-saturated or partially-saturated 5- to 6-membered monocyclic ring, wherein each said ring contains 0, 1, or 2 N atoms and 0 or 1 O atoms, and wherein each said L¹ is substituted by 0, 1 or 2 R⁹ groups which are F, Cl, Br, C₁₋₆alk, —OR^(a), CN, —C(═O)R^(b), C(═O)OR^(a), —C(═O)NR^(a)R^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c).

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, L¹ is a carbon-linked-unsaturated 5- to 6-membered monocyclic ring, wherein each said ring contains 0, 1, or 2 N atoms and 0 or 1 O atoms, and wherein each said L¹ is substituted by 0, 1 or 2 R⁹ groups which are F, Cl, Br, C₁₋₆alk, —OR^(a), CN, —C(═O)R^(b), C(═O)OR^(a), —C(═O)NR^(a)R^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c).

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, L¹ is a carbon-linked-saturated, partially-saturated or unsaturated 6-, 7-, 8-, 9-, or 10-membered bicyclic ring, wherein each said ring contains 0, 1, or 2 N atoms and 0 or 1 O atoms, and wherein each said L¹ is substituted by 0, 1 or 2 R⁹ groups which are F, Cl, Br, C₁₋₆alk, —OR^(a), CN, —C(═O)R^(b), C(═O)OR^(a), —C(═O)NR^(a)R^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c).

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, L¹ is a nitrogen-linked saturated, partially-saturated or unsaturated 4-, 5-, 6-, or 7-membered monocyclic ring, wherein said ring contains 0, 1, 2, 3, or 4 N atoms and 0 or 1 O atoms, and wherein each said L¹ is substituted by 0, 1 or 2 R⁹ groups which are F, Cl, Br, C₁₋₆alk, —OR^(a), CN, —C(═O)R^(b), C(═O)OR^(a), —C(═O)NR^(a)R^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c).

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, L¹ is a nitrogen-linked saturated, partially-saturated or unsaturated 6-, 7-, 8-, 9-, 10-, 11-, or 12-membered bicyclic ring, wherein each said ring contains 0, 1, or 2 N atoms and 0 or 1 O atoms, and wherein each said L¹ is substituted by 0, 1 or 2 R⁹ groups which are F, Cl, Br, C₁₋₆alk, —OR^(a), CN, —C(═O)R^(b), C(═O)OR^(a), —C(═O)NR^(a)R^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c).

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, L¹ is −3-azabicyclo[3.1.0]hexanyl, azetidinyl, indolyl, phenyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, pyrazolyl, piperazinonyl, piperidinyl, pyrrolidinyl, dihydropyranyl, tetrahydropyridinyl, octahydropyrrolo[3,4-c]pyrrolyl, tetrahydroisoquinolinyl, which are substituted by 0, 1 or 2 R⁹ groups which are F, Cl, Br, C₁₋₆alk, —OR^(a), CN, —C(═O)R^(b), C(═O)OR^(a), —C(═O)NR^(a)R^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c).

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ is selected from the group consisting of: Cl; Br; —C≡C—CH₃; —NH—CH(CH₃)₂; —NHCH₂CH₂OCH₃; —NHCH₂CH₂OH;

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof. R¹ is selected from the group consisting of:

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ is selected from the group consisting of:

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, each R² and R³ is independently H, F, Cl, Br, CN, OH, OC₁₋₄alk, C₁₋₄alk or C₁₋₄haloalk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R⁶ is H, F, or C₁₋₄alk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R^(4a) is H, F, OH, or methyl.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R^(4b) is oxo and m is 1

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R^(4a) is H and m is 0.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R⁵ is pyridinyl.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R⁵ is unsaturated 9- to 10-membered bicyclo-heterocyclic ring.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R⁵ is 11- to 15-membered tricyclo-heterocyclic ring.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group —Y—R⁵ is:

wherein each R⁵ is substituted by 1 or 2 R⁸ groups.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group —Y—R⁵ is:

wherein each R⁵ is substituted by 1 or 2 R⁸ groups.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group —Y—R⁵ is:

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, Y is a bond or —C(═O).

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, Y is a bond.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R⁸ is independently F, Br, Cl, CF₃, methyl, methoxy, or CN.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R^(a) is H or C₁₋₆alk substituted by 0 or 1 —OH, —OC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R^(c) is a C₀₋₄alk-carbon-linked saturated, partially-saturated or unsaturated 3-, 4- 5-, or 6-membered monocyclic ring containing 0, 1, or 2 N atoms and 0 or 1 atom which are O or S, which is substituted by 0 or 1 R¹¹ groups which are F, C₁₋₆alk, C₁₋₄haloalk, or —OR^(a).

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R^(c) is pyridyl, phenyl, or 1,2,4-oxadiazolyl.

Another aspect of the current invention relates to compounds having the general structure of formula (II):

or a pharmaceutically acceptable salt thereof, wherein:

R¹, which is Ring D, is -L¹;

X¹ is N or CR⁶;

X² is N or CR²;

X³ is N or CR³;

X⁴ is N or CR⁶;

wherein 1 to 2 of X¹, X², X³, and X⁴ are N;

Y is a C₀₋₄alk, —C(═O), SO, or SO₂;

each R² and R³ is independently H, halo, CN, OH, —OC₁₋₄alk, C₁₋₄alk, C₁₋₄haloalk, —C₁₋₆alkOR¹, —C(═O)C₁₋₄alk, —C(═O)NR^(a)R^(a), —C₀₋₄alkNH—C(═O)R^(a), or R^(c);

or alternatively the ring containing X¹, X², X³, X⁴ and X⁵ can be fused to ring A, ring B, or ring C; having the formula:

wherein each said ring A, ring B, or ring C is a fused 4- to 6-membered-saturated, -partially saturated, or -unsaturated-carbocyclic or -heterocyclic ring containing 0, 1, 2, or 3 heteroatoms; and is substituted by 0, 1, or 2 R¹⁰ groups;

R^(4a) is H, OH, halo, C₁₋₄alk, or C₁₋₄haloalk;

R^(4b) is halo, CN, OH, OC₁₋₄alk, C₁₋₄alk, C₁₋₄haloalk, or oxo;

R⁵ is pyridinyl or unsaturated 9- to 10-membered bicyclo-heterocyclic ring; wherein each R⁵ is substituted by 0, 1, 2 or 3 R⁸ groups;

R⁶ is independently H, halo, CN, OH, OC₁₋₄alk, C₁₋₄alk or C₁₋₄haloalk;

m is 0, 1, 2, 3, or 4;

each of p and q is independently 0, 1, 2, 3, 4, 5, or 6; wherein the sum of p and q is 2 to 6;

the ring containing p and q contains 0, 1, or 2 double bonds;

R^(a) is independently H or R^(b);

R^(b) is independently phenyl, benzyl, or C₁₋₆alk, wherein said phenyl, benzyl, or C₁₋₆alk substituted by 0, 1, 2 or 3 substituents which are, independently, halo, C₁₋₄alk, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk;

R^(c) is C₀₋₄alk-L²;

each L¹ is independently a carbon-linked or nitrogen-linked saturated, partially-saturated or unsaturated 3-, 4-, 5-, 6-, or 7-membered monocyclic ring or a saturated, partially-saturated or unsaturated 6-, 7-, 8-, 9-, 10-, 11-, or 12-membered bicyclic ring, wherein each said ring contains 0, 1, 2, 3, or 4 N atoms and 0, 1, or 2 atoms which are O or S; wherein each L¹ is independently substituted by 0, 1, 2 or 3 R⁹ groups;

each L² is independently a carbon-linked or nitrogen-linked saturated, partially-saturated or unsaturated 3-, 4-, 5-, 6-, or 7-membered monocyclic ring or a saturated, partially-saturated or unsaturated 6-, 7-, 8-, 9-, 10-, 11-, or 12-membered bicyclic ring, wherein each said ring contains 0, 1, 2, 3, or 4 N atoms and 0, 1, or 2 atoms which are O or S; wherein each L² is independently substituted by 0, 1, 2 or 3 R¹¹ groups;

R⁸ is halo, CN, OH, OC₁₋₄alk, C₁₋₄alk, C₁₋₄haloalk, OC₁₋₄haloalk, —C(═O)R^(b), —C(═O)R^(c), —C(═O)NHR^(b), —C(═O)NHR^(c), —S(═O)₂R^(b), —S(═O)₂R^(c), —S(═O)₂NR^(a)R^(a), R^(b), R^(c), NO₂, OR^(b), or OR^(c);

R⁹ is F, Cl, Br, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —C(═O)NR^(a)R^(a), —C(═NR^(a))NR^(a)R^(a), —OC(═O)R^(b), —OC(═O)NR^(a)R^(a), —OC₁₋₆alkNR^(a)R^(a), —OC₁₋₆alkOR^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —S(═O)₂NR^(a)R^(a), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —N(R^(a))C(═O)NR^(a)R^(a), —N(R^(a))C(═NR^(a))NR^(a)R^(a), —N(R^(a))S(═O)₂R^(b), —N(R^(a))S(═O)₂NR^(a)R^(a), —NR^(a)C₁₋₆alkNR^(a)R^(a), —NR^(a)C₁₋₆alkOR^(a), —C₁₋₆alkNR^(a)R^(a), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c);

R¹⁰ is oxo, C₁₋₆alk, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk; and

R¹¹ is F, Cl, Br, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —C(═O)NR^(a)R^(a), —C(═NR^(a))NR^(a)R^(a), —OC(═O)R^(b), —OC(═O)NR^(a)R^(a), —OC₁₋₆alkNR^(a)R^(a), —OC₁₋₆alkOR^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —S(═O)₂NR^(a)R^(a), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —N(R^(a))C(═O)NR^(a)R^(a), —N(R^(a))C(═NR^(a))NR^(a)R^(a), —N(R^(a))S(═O)₂R^(b), —N(R^(a))S(═O)₂NR^(a)R^(a), —NR^(a)C₁₋₆alkNR^(a)R^(a), —NR^(a)C₁₋₆alkOR^(a), —C₁₋₆alkNR^(a)R^(a), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), or oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group

is azetidinyl, pyrrolidinyl, piperidinyl, or azepanyl.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the compound of formula (II) has the formula:

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the compound of formula (II) has the formula:

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the compound of formula (II) has the formula:

In another embodiment of the compound of formula (IIg), R^(4b) is oxo; m is 1; and R⁵ is unsaturated 10-membered bicyclo-heterocyclic ring; wherein each R⁵ ring is substituted by 0, 1, or 2 R⁸ groups.

In another embodiment of the compound of formula (IIg), said compound has the formula

wherein m is 0; and R⁵ is unsaturated 10-membered bicyclo-heterocyclic ring; wherein each R⁵ ring is substituted by 0, 1, or 2 R⁸ groups.

In another embodiment of any of the compound of the formula (IIa), (IIb), (IIc), (IId), (IIe), (IIf), and (IIg), the group —Y—R⁵ is:

Y is a bond; wherein each R⁵ is substituted by 1 or 2 R⁸ groups; and R⁸ is independently F, Cl, Br, methyl, ethyl, isopropyl, methoxy, CN, CF₃, OH, or OCF₃.

In another embodiment of any of the compound of the formula (IIa), (IIb), (IIc), (IId), (IIe), (IIf), and (IIg), or a pharmaceutically acceptable salt thereof, the group —Y—R⁵ is:

Y is a bond; wherein R⁸ is independently F, Cl, Br, methyl, ethyl, isopropyl, methoxy, CN, CF₃, OH, or OCF₃.

Another aspect of the current invention relates to compounds having the general structure of formula (III):

or a pharmaceutically-acceptable salt thereof, wherein:

X¹ is N or CR⁶;

R¹ is F, Cl, Br, I, C₁₋₈alk, C₁₋₄haloalk, —OR^(a), —OR^(c), —N(R^(a))C(═O)R^(b), —C(═O)R^(a), —C(═O)R^(c), —C(═O)—O—R^(a), —NR^(a)R^(c), —N(R^(c))C(═O)R^(b), —N(R^(a))C(═O)R^(c), —C(═O)NR^(a)R^(b), —C(═O)NR^(a)R^(c) or C₀₋₄alk-L¹; wherein said C₁₋₈alk group is substituted by 0, 1, 2 or 3 groups selected from halo, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk,

—OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk;

Y is a C₀₋₄alk, —C(═O), SO, or SO₂;

each of R², R³, R^(4b), R⁶ and R⁸ is independently H, F, Cl, Br, I, CN, OH, OC₁₋₄alk, C₁₋₄alk or C₁₋₄haloalk;

or alternatively R² and R³ can form an optionally substituted 5- to 6-membered-saturated, -partially saturated, or -unsaturated-heterocyclic ring fused to the ring containing X¹;

R^(4a) is H, C₁₋₄alk, or C₁₋₄haloalk;

R⁵ is pyridinyl or unsaturated 9- or 10-membered bicyclo-heterocyclic ring;

wherein each R⁵ is substituted by 0, 1, 2 or 3 R⁸ groups; and is not substituted by oxo;

m is 1, 2, 3, or 4;

each of p and q is independently 0, 1, 2, 3, 4, 5, or 6; wherein the sum of p and q is 2 to 6;

R^(a) is independently H or R^(b);

R^(b) is independently phenyl, benzyl, or C₁₋₆alk, wherein said phenyl, benzyl, and C₁₋₆alk are being substituted by 0, 1, 2 or 3 substituents selected from halo, C₁₋₄alk, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk;

R^(c) is C₀₋₄alk-L²; and

each of L¹ and L² is independently a carbon-linked or nitrogen-linked saturated, partially-saturated or unsaturated 3-, 4-, 5-, 6-, or 7-membered monocyclic ring or a saturated, partially-saturated or unsaturated 8-, 9-, 10-, 11-, or 12-membered bicyclic ring, wherein each said ring contains 0, 1, 2, 3, or 4 N atoms and 0, 1, or 2 atoms selected from O and S; wherein each L¹ and L² is independently substituted by 0, 1, 2 or 3 R⁹ groups selected from F, Cl, Br, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —C(═O)NR^(a)R^(a), —C(═NR^(a))NR^(a)R^(a), —OC(═O)R^(b), —OC(═O)NR^(a)R^(a), —OC₂₋₆alkNR^(a)R^(a), —OC₂₋₆alkOR^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —S(═O)₂NR^(a)R^(a), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —N(R^(a))C(═O)NR^(a)R^(a), —N(R^(a))C(═NR^(a))NR^(a)R^(a), —N(R^(a))S(═O)₂R^(b), —N(R^(a))S(═O)₂NR^(a)R^(a), —NR^(a)C₂₋₆alkNR^(a)R^(a), —NR^(a)C₂₋₆alkOR^(a), —C₁₋₆alkNR^(a)R^(a), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a) or oxo;

with the proviso that: when all X¹, X², and X³ are CR³; each of p and q is 2; and R³ is methyl; then R¹ is F, Cl, Br, I, C₁₋₈alk, C₁₋₄haloalk, —OR^(a), —OR^(c), —N(R^(a))C(═O)R^(b), —NR^(a)R^(c), —N(R^(c))C(═O)R^(b), —N(R^(a))C(═O)R^(c) or C₀₋₄alk-L¹; wherein said C₁₋₈alk group is substituted by 0, 1, 2 or 3 groups selected from halo, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R⁵ is not substituted by oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group:

wherein each of Y₁, Y₂, Y₃, M₁, M₂, M₃, and M₄ is independently CR¹⁰ or a heteroatom selected from S, O, or NR¹¹; wherein no more than of Y₁, Y₂, Y₃, M₁, M₂, M₃, and M₄ are N; and

wherein R¹⁰ is H, halo, C₁₋₄alk, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk; and R^(H) is H, C₁₋₄alk, or C₁₋₃haloalk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group

each of p and q is 2; R⁵ is unsaturated 9-membered bicyclo-heterocyclic ring; and Y is C₀₋₄alk; and R¹ is C₀₋₄alk-L¹.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, m is 1 or 2.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, p is 0, 1, or 2.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, q is 0, 1, or 2.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ is F, Cl, Br, I, —OR^(a), —C(═O)—O—R^(a), —C(═O)NR^(a)R^(b), —OR^(c), or —C(═O)NR^(a)R^(c).

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ is a saturated, partially-saturated or unsaturated 4-, 5-, 6-, or 7-membered monocyclic ring, wherein each said ring contains 0, 1, 2, or 3 N atoms and 0, 1, or 2 O atoms, and wherein each said ring is substituted by 0, 1, 2 or 3 R⁹ groups selected from F, Cl, Br, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —NR^(a)R^(a), SR^(a), or oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ is a saturated or partially-saturated 5- to 6-membered monocyclic ring, wherein each said ring contains 0, 1, 2, or 3 N atoms and 0, 1, or 2 O atoms, and wherein each said ring is substituted by 0, 1, 2 or 3 R⁹ groups selected from F, Cl, Br, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —NR^(a)R^(a), SR^(a), or oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ is a saturated, partially-saturated or unsaturated 8-, 9-, 10-, 11-, or 12-membered bicyclic ring, wherein each said ring contains 0, 1, 2, or 3 N atoms and 0, 1, or 2 O atoms, and wherein each said ring is substituted by 0, 1, 2 or 3 R⁹ groups selected from F, Cl, Br, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —NR^(a)R^(a), SR^(a), or oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ is a nitrogen-linked saturated, partially-saturated or unsaturated 4-, 5-, 6-, or 7-membered monocyclic ring wherein each said ring contains 0, 1, 2, 3, or 4 N atoms and 0, 1, or 2 atoms selected from O and S; substituted by 0, 1, 2 or 3 R⁹ groups selected from F, Cl, Br, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —NR^(a)R^(a), SR^(a), or oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ is cyclohexyl, cyclopentyl, cyclopentenyl, cyclohexenyl, cycloheptyl, azetidinyl, phenyl, 2-pyridyl, 3-pyridyl, pyrazolyl, morpholinyl, pyrimidyl, piperazinyl, piperidinyl, dihydropyranyl, tetrahydropyranyl, tetrahydrofuranyl, tetrahydropyridinyl, tetrahydrothiopyranyl, oxaspiro[3.5]nonyl, azepanyl, oxepanyl, or quinolinyl, all of which are substituted by 0, 1, 2 or 3 R⁹ groups selected from F, Cl, Br, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), CN, —C(═O)R^(b), —C(═O)OR^(a), —SR^(a), or oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ is:

wherein the dotted bond is an optional double bond.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, each R² and R³ is independently H, F, Cl, Br, CN, OH, OC₁₋₄alk, C₁₋₄alk or C₁₋₄haloalk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, each R² and R³ is H, C₁₋₄alk, or C₁₋₄haloalk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R² and R³ are H.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R² and R³ form an optionally substituted 5- to 6-membered-saturated, -partially saturated, or -unsaturated-heterocyclic ring fused to the ring containing X¹.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, X¹ is N.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, X¹ is CR⁶; wherein R⁶ is H, F, Cl, Br, I, OC₁₋₄alk, or C₁₋₄alk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R⁶ is H or C₁₋₄alk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R^(4a) is H or C₁₋₄alk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R^(4b) is independently H, F, CN, OC₁₋₄alk, C₁₋₄alk or C₁₋₄haloalk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, each of R^(4a) and R^(4b) is H.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R⁵ is pyridinyl.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R⁵ is unsaturated 9- or 10-membered bicyclo-heterocyclic ring; wherein the ring is aromatic.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R⁵ is unsaturated 9-membered bicyclo-heterocyclic ring; wherein the ring is aromatic.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R⁵ is unsaturated 10-membered bicyclo-heterocyclic ring; wherein the ring is aromatic.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group —Y—R⁵ is:

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group —Y—R⁵ is:

and Y is C(═O).

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, Y is —C(═O).

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, Y is a bond or C₁₋₃alk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R⁵ is:

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R⁸ is independently H, F, CN, OC₁₋₄alk, C₁₋₄alk or C₁₋₄haloalk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R⁸ is H.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R^(a) is H or C₁₋₆alk substituted by 0 or 1 —OH, —OC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R^(c) is a carbon-linked saturated, partially-saturated or unsaturated 3-, 4- 5-, or 6-membered monocyclic ring containing 0 or 1 N atom and 0 or 1 atom selected from O and S, which is substituted by 0 or 1 R⁹ groups selected from F, C₁₋₆alk, C₁₋₄haloalk, or —OR^(a).

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R^(c) is a nitrogen-linked saturated, partially-saturated, or unsaturated 4-, 5-, 6- or 7-membered ring heterocycle containing the linking nitrogen and 0, 1 or 2 additional nitrogen atoms and containing 0 or 1 sulfur or oxygen atom, the heterocycle being substituted by 0, 1, 2 or 3 R⁹ groups selected from F, Cl, Br, C₁₋₄alk, C₁₋₄haloalk, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —N(C₁₋₄alk)C₁₋₄alk, or oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R^(c) is a C₀₋₄alk-saturated, partially-saturated or unsaturated 3-, 5-, or 6-membered monocyclic ring containing 0 or 1 N atom and 0 or 1 atom selected from O and S, which is substituted by 0 or 1 R⁹ groups selected from F, C₁₋₆alk, C₁₋₄haloalk, or —OR^(a).

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the compound has the following formula (Ma):

wherein R¹ is F, Cl, Br, I, C₁₋₈alk, C₁₋₄haloalk, —OR^(a), —OR^(c), —N(R^(a))C(═O)R^(b), —NR^(a)R^(c), —N(R^(c))C(═O)R^(b), —N(R^(a))C(═O)R^(c) or C₀₋₄alk-L¹; wherein said C₁₋₈alk group is substituted by 0, 1, 2 or 3 groups selected from halo, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk; and R³ is not methyl.

Another aspect of the current invention relates to compounds having the general structure of formula (IV):

or any pharmaceutically-acceptable salt thereof, wherein:

R¹, which is Ring D, is -L¹;

X¹ is N or CR⁶;

Y is a C₀₋₄alk, —C(═O), SO, or SO₂;

each of R², R³, R^(4b), R⁶ and R⁸ is independently H, F, Cl, Br, I, CN, OH, OC₁₋₄alk, C₁₋₄alk or C₁₋₄haloalk;

or alternatively R² and R³ can form an optionally substituted 5- to 6-membered-saturated, -partially saturated, or -unsaturated-heterocyclic ring fused to the ring containing X¹;

R^(4a) is H, C₁₋₄alk, or C₁₋₄haloalk;

R⁵ is pyridinyl or unsaturated 9- or 10-membered bicyclo-heterocyclic ring; wherein each R⁵ is substituted by 0, 1, 2 or 3 R⁸ groups; and is not substituted by oxo;

m is 1, 2, 3, or 4;

each of p and q is independently 0, 1, 2, 3, 4, 5, or 6; wherein the sum of p and q is 2 to 6;

R^(a) is independently H or R^(b);

R^(b) is independently phenyl, benzyl, or C₁₋₆alk, wherein said phenyl, benzyl, and C₁₋₆alk are being substituted by 0, 1, 2 or 3 substituents selected from halo, C₁₋₄alk, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —OC(═O)C₁₋₄alk, and —N(C₁₋₄alk)C₁₋₄alk; and

each of L¹ and L² is independently a carbon-linked or nitrogen-linked saturated, partially-saturated or unsaturated 3-, 4-, 5-, 6-, or 7-membered monocyclic ring or a saturated, partially-saturated or unsaturated 8-, 9-, 10-, 11-, or 12-membered bicyclic ring, wherein each said ring contains 0, 1, 2, 3, or 4 N atoms and 0, 1, or 2 atoms selected from O and S; wherein each L¹ and L² is independently substituted by 0, 1, 2 or 3 R⁹ groups selected from F, Cl, Br, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —C(═O)NR^(a)R^(a), —C(═NR^(a))NR^(a)R^(a), —OC(═O)R^(b), —OC(═O)NR^(a)R^(a), —OC₂₋₆alkNR^(a)R^(a), —OC₂₋₆alkOR^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —S(═O)₂NR^(a)R^(a), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —N(R^(a))C(═O)NR^(a)R^(a), —N(R^(a))C(═NR^(a))NR^(a)R^(a), —N(R^(a))S(═O)₂R^(b), —N(R^(a))S(═O)₂NR^(a)R^(a), —NR^(a)C₂₋₆alkNR^(a)R^(a), —NR^(a)C₂₋₆alkOR^(a), —C₁₋₆alkNR^(a)R^(a), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a) and oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group

is azetidinyl, pyrrolidinyl, piperidinyl, or azepanyl; wherein each group is not substituted by oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group

is azetidinyl; which is not substituted by oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group

is pyrrolidinyl; which is not substituted by oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group

is piperidinyl; which is not substituted by oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group

is azepanyl; which is not substituted by oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group

is azetidinyl or piperidinyl; which is not substituted by oxo; and Y is —C(═O), SO, or SO₂.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, the group

is azetidinyl; which is not substituted by oxo; and Y is —C(═O), SO, or SO₂.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ or ring D is a carbon-linked saturated, partially-saturated or unsaturated 4-, 5-, 6-, or 7-membered monocyclic ring, wherein each said ring contains 0, 1, 2, 3, or 4 N atoms and 0, 1, or 2 atoms selected from O and S; independently substituted by 0, 1, 2 or 3 R⁹ groups selected from F, Cl, Br, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —C(═O)NR^(a)R^(a), —C(═NR^(a))NR^(a)R^(a), —OC(═O)R^(b), —OC(═O)NR^(a)R^(a), —OC₂₋₆alkNR^(a)R^(a), —OC₂₋₆alkOR^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —S(═O)₂NR^(a)R^(a), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —N(R^(a))C(═O)NR^(a)R^(a), —N(R^(a))C(═NR^(a))NR^(a)R^(a), —N(R^(a))S(═O)₂R^(b), —N(R^(a))S(═O)₂NR^(a)R^(a), —NR^(a)C₂₋₆alkNR^(a)R^(a), —NR^(a)C₂₋₆alkOR^(a), —C₁₋₆alkNR^(a)R^(a), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a) and oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ or ring D is a carbon-linked-saturated, partially-saturated or unsaturated 8-, 9-, 10-, 11-, or 12-membered bicyclic ring, wherein each said ring contains 0, 1, 2, 3, or 4 N atoms and 0, 1, or 2 atoms selected from O and S; independently substituted by 0, 1, 2 or 3 R⁹ groups selected from F, Cl, Br, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —C(═O)NR^(a)R^(a), —C(═NR^(a))NR^(a)R^(a), —OC(═O)R^(b), —OC(═O)NR^(a)R^(a), —OC₂₋₆alkNR^(a)R^(a), —OC₂₋₆alkOR^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —S(═O)₂NR^(a)R^(a), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —N(R^(a))C(═O)NR^(a)R^(a), —N(R^(a))C(═NR^(a))NR^(a)R^(a), —N(R^(a))S(═O)₂R^(b), —N(R^(a))S(═O)₂NR^(a)R^(a), —NR^(a)C₂₋₆alkNR^(a)R^(a), —NR^(a)C₂₋₆alkOR^(a), —C₁₋₆alkNR^(a)R^(a), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a) and oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ or ring D is a nitrogen-linked saturated, partially-saturated or unsaturated 4-, 5-, 6-, or 7-membered monocyclic ring, wherein each said ring contains 0, 1, 2, 3, or 4 N atoms and 0, 1, or 2 atoms selected from O and S; independently substituted by 0, 1, 2 or 3 R⁹ groups selected from F, Cl, Br, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —C(═O)NR^(a)R^(a), —C(═NR^(a))NR^(a)R^(a), —OC(═O)R^(b), —OC(═O)NR^(a)R^(a), —OC₂₋₆alkNR^(a)R^(a), —OC₂₋₆alkOR^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —S(═O)₂NR^(a)R^(a), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —N(R^(a))C(═O)NR^(a)R^(a), —N(R^(a))C(═NR^(a))NR^(a)R^(a), —N(R^(a))S(═O)₂R^(b), —N(R^(a))S(═O)₂NR^(a)R^(a), —NR^(a)C₂₋₆alkNR^(a)R^(a), —NR^(a)C₂₋₆alkOR^(a), —C₁₋₆alkNR^(a)R^(a), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a) and oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ or ring D is a nitrogen-linked-saturated, partially-saturated or unsaturated 8-, 9-, 10-, 11-, or 12-membered bicyclic ring, wherein each said ring contains 0, 1, 2, 3, or 4 N atoms and 0, 1, or 2 atoms selected from O and S; independently substituted by 0, 1, 2 or 3 R⁹ groups selected from F, Cl, Br, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —C(═O)NR^(a)R^(a), —C(═NR^(a))NR^(a)R^(a), —OC(═O)R^(b), —OC(═O)NR^(a)R^(a), —OC₂₋₆alkNR^(a)R^(a), —OC₂₋₆alkOR^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —S(═O)₂NR^(a)R^(a), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —N(R^(a))C(═O)NR^(a)R^(a), —N(R^(a))C(═NR^(a))NR^(a)R^(a), —N(R^(a))S(═O)₂R^(b), —N(R^(a))S(═O)₂NR^(a)R^(a), —NR^(a)C₂₋₆alkNR^(a)R^(a), —NR^(a)C₂₋₆alkOR^(a), —C₁₋₆alkNR^(a)R^(a), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a) and oxo.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, ring D is cyclohexyl, cyclopentyl, cyclopentenyl, cyclohexenyl, or cycloheptyl.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ or ring D is azetidinyl, phenyl, 2-pyridyl, 3-pyridyl, pyrazolyl, morpholinyl, pyrimidyl, piperazinyl, piperidinyl, dihydropyranyl, tetrahydropyranyl, tetrahydrofuranyl, tetrahydropyridinyl, or tetrahydrothiopyranyl.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ or ring D is oxaspiro[3.5]nonyl, azepanyl, oxepanyl, or quinolinyl.

In another embodiment of the compound of formula (I), (II), (III), or (IV), or a pharmaceutically acceptable salt thereof, R¹ or ring D is cyclohexyl, cyclopentyl, cyclopentenyl, cyclohexenyl, cycloheptyl, azetidinyl, phenyl, 2-pyridyl, 3-pyridyl, pyrazolyl, morpholinyl, pyrimidyl, piperazinyl, piperidinyl, dihydropyranyl, tetrahydropyranyl, tetrahydrofuranyl, tetrahydropyridinyl, tetrahydrothiopyranyl, oxaspiro[3.5]nonyl, azepanyl, oxepanyl, or quinolinyl, all of which are substituted by 0, 1, 2 or 3 R⁹ groups selected from F, Cl, Br, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), CN, —C(═O)R^(b), —C(═O)OR^(a), —NR^(a)R^(a), —SR^(a), and oxo.

Another aspect of the invention relates to a compound of formula (IV) having the formula:

wherein m, Ring D, R², R³, R^(4a), R^(4b), R⁵, Y, and X¹ are defined above.

Another aspect of the invention relates to a compound having the formula:

wherein m, Ring D, R², R³, R^(4a), R^(4b), R⁵, Y, and X¹ are defined above.

Another aspect of the invention relates to a compound having the formula:

wherein m, Ring D, R², R³, R^(4a), R^(4b), R⁵, Y, and X¹ are defined above.

Another aspect of the invention relates to a method of treating conditions that may be treated with PDE10 inhibitors comprising the step of administering to a patient in need thereof a therapeutically effective amount of any one of the above compounds, or a pharmaceutically acceptable salt thereof.

In one embodiment of the method, said conditions is psychoses, Parkinson's disease, dementias, obsessive compulsive disorder, tardive dyskinesia, choreas, depression, mood disorders, impulsivity, drug addiction, attention deficit/hyperactivity disorder (ADHD), depression with parkinsonian states, personality changes with caudate or putamen disease, dementia and mania with caudate and pallidal diseases, or compulsions with pallidal disease.

In another embodiment of the method, said condition is schizophrenia, Huntington's disease, bipolar disorder, or obsessive-compulsive disorder.

In another embodiment of the method, said condition is schizophrenia.

Another aspect of the invention relates to a pharmaceutical composition comprising any one of the above compounds, or a pharmaceutically acceptable salt thereof, and a pharmaceutically-acceptable excipient.

Another aspect of the invention relates to the use of any one of the above compounds, or a pharmaceutically acceptable salt thereof, as a medicament.

Another aspect of the invention relates to the use of any one of the above compounds, or a pharmaceutically acceptable salt thereof in the manufacture of a medicament for the treatment of schizophrenia, bipolar disorder, or obsessive-compulsive disorder.

Another aspect of the invention relates to a compound, or a pharmaceutically acceptable salt thereof, which is tabulated below:

Chemical Structure Chemical Name

(1H-Benzoimidazol-2-yl)-[3-(3-phenyl- pyridin-2-yl)-azetidin-1-yl]-methanone

(1H-Benzoimidazol-2-yl)-[3-(5-fluoro-3- phenyl-pyridin-2-yl)-azetidin-1-yl]- methanone

(1H-benzoimidazol-2-yl)-[4-(3-phenyl- pyrazin-2-yl)-piperidin-1-yl]-methanone

Benzothiazol-2-yl-[3-(3-phenyl-pyrazin-2- yl)-azetidin-1-yl]-methanone

(1H-Benzoimidazol-2-yl)-[3-(3-piperidin- 1-yl-quinoxalin-2-yl)-azetidin-1-yl]- methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(4- hydroxy-piperidin-1-yl)-quinoxalin-2-yl]- azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-[3-(2,3-dihydro- indol-1-yl)-3′,4′,5′,6′-tetrahydro-2′H- [2,4′]bipyridinyl-1′-yl]-methanone

(1H-Benzoimidazol-2-yl)-[3-(3-phenyl- quinolin-2-yl)-azetidin-1-yl]-methanone

(1H-Benzoimidazol-2-yl)-(3-phenyl- 3′,4′,5′,6′-tetrahydro-2′H-[2,4′]bipyridinyl- 1′-yl)-methanone

(1H-Benzoimidazol-2-yl)-{4-[3-(4- hydroxymethyl-piperidin-1-yl)-pyrazin-2- yl]-piperidin-1-yl}-methanone

(3-(3-phenylpyrazin-2-yl)azetidin-1- yl)(pyridin-2-yl)methanone

(6-methylpyridin-2-yl)(3-(3- phenylpyrazin-2-yl)azetidin-1- yl)methanone

(3-methylpyridin-2-yl)(3-(3- phenylpyrazin-2-yl)azetidin-1- yl)methanone

(5-methylpyridin-2-yl)(3-(3- phenylpyrazin-2-yl)azetidin-1- yl)methanone

(4-methylpyridin-2-yl)(3-(3- phenylpyrazin-2-yl)azetidin-1- yl)methanone

(1H-Benzoimidazol-2-yl)-[3-(3-phenyl- quinoxalin-2-yl)-azetidin-1-yl]-methanone

(1H-Benzoimidazol-2-yl)-[3-(3-morpholin- 4-yl-pyrazin-2-yl)-azetidin-1-yl]- methanone

(1-Methyl-1H-benzoimidazol-2-yl)-[3-(3- phenyl-pyrazin-2-yl)-azetidin-1-yl]- methanone

[3-(3-Phenyl-pyrazin-2-yl)-azetidin-1-yl]- [1-(2,2,2-trifluoro-ethyl)-1H- benzoimidazol-2-yl]-methanone

(1H-Benzoimidazol-2-yl)-[3-(3-phenyl- pyrazin-2-yl)-azetidin-1-yl]-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(3,4- dimethoxy-phenyl)-pyrazin-2-yl]-azetidin- 1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(3- isopropyl-phenyl)-pyrazin-2-yl]-azetidin- 1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(3- trifluoromethoxy-phenyl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

1H-Benzoimidazol-2-yl)-{3-[3-(3,5- dimethoxy-phenyl)-pyrazin-2-yl]-azetidin- 1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(3-ethoxy- phenyl)-pyrazin-2-yl]-azetidin-1-yl}- methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(3- isopropoxy-phenyl)-pyrazin-2-yl]-azetidin- 1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(3-fluoro- 5-methoxy-phenyl)-pyrazin-2-yl]-azetidin- 1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(2- methoxy-pyridin-4-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(5- methoxy-pyridin-3-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(1H-benzo[d]imidazol-2-yl)(3-(3-(4- fluoro-3-methylphenyl)pyrazin-2- yl)azetidin-1-yl)methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(4- methoxy-3-methyl-phenyl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(3-fluoro- 5-methyl-phenyl)-pyrazin-2-yl]-azetidin-1- yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(5-methyl- pyridin-3-yl)-pyrazin-2-yl]-azetidin-1-yl}- methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(4-methyl- thiophen-2-yl)-pyrazin-2-yl]-azetidin-1- yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(1-methyl- 1H-pyrazol-4-yl)-pyrazin-2-yl]-azetidin-1- yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(3- hydroxymethyl-phenyl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(4- hydroxymethyl-phenyl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

1-(4-{3-[1-(1H-Benzoimidazole-2- carbonyl)-azetidin-3-yl]-pyrazin-2-yl}- phenyl)-ethanone

1-(3-{3-[1-(1H-Benzoimidazole-2- carbonyl)-azetidin-3-yl]-pyrazin-2-yl}- phenyl)-ethanone

(1H-Benzoimidazol-2-yl)-{3-[3-(3- methoxymethyl-phenyl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

4-{3-[1-(1H-Benzoimidazole-2-carbonyl)- azetidin-3-yl]-pyrazin-2-yl}-N,N- dimethyl-benzamide

3-{3-[1-(1H-Benzoimidazole-2-carbonyl)- azetidin-3-yl]-pyrazin-2-yl}-N,N- dimethyl-benzamide

(1H-benzo[d]imidazol-2-yl)(3-(3-(pyridin- 4-yl)pyrazin-2-yl)azetidin-1-yl)methanone

(7-chloro-1H-benzo[d]imidazol-2-yl)(3-(3- (pyridin-3-yl)pyrazin-2-yl)azetidin-1- yl)methanone

(1H-benzo[d]imidazol-2-yl)(3-(3-(2- methylpyridin-4-yl)pyrazin-2-yl)azetidin- 1-yl)methanone

(1H-benzo[d]imidazol-2-yl)(3-(3-(m- tolyl)pyrazin-2-yl)azetidin-1-yl)methanone

3-(3-(1-(1H-benzo[d]imidazole-2- carbonyl)azetidin-3-yl)pyrazin-2- yl)benzonitrile

(1-Methyl-1H-benzoimidazol-2-yl)-[3-(3- piperidin-1-yl-pyrazin-2-yl)-azetidin-1-yl]- methanone

{3-[3-(4-Hydroxy-piperidin-1-yl)-pyrazin- 2-yl]-azetidin-1-yl}-(1-methyl-1H- benzoimidazol-2-yl)-methanone

[3-(3-Piperidin-1-yl-pyrazin-2-yl)-azetidin- 1-yl]-[1-(2,2,2-trifluoro-ethyl)-1H- benzoimidazol-2-yl]-methanone

{3-[3-(4-Hydroxy-piperidin-1-yl)-pyrazin- 2-yl]-azetidin-1-yl}-[1-(2,2,2-trifluoro- ethyl)-1H-benzoimidazol-2-yl]-methanone

(1H-Benzoimidazol-2-yl)-[3-(3-pyrrolidin- 1-yl-pyrazin-2-yl)-azetidin-1-yl]- methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(4- trifluoromethyl-piperidin-1-yl)-pyrazin-2- yl]-azetidin-1-yl}-methanone

(R & S)-(1H-Benzoimidazol-2-yl)-{3-[3- (2-methyl-piperidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(3-methyl- piperidin-1-yl)-pyrazin-2-yl]-azetidin-1- yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(4-methyl- piperidin-1-yl)-pyrazin-2-yl]-azetidin-1- yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(4,4- dimethyl-piperidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(4- hydroxymethyl-piperidin-1-yl)-pyrazin-2- yl]-azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-(3-{3-[4-(1- hydroxy-1-methyl-ethyl)-piperidin-1-yl]- pyrazin-2-yl}-azetidin-1-yl)-methanone

(1H-Benzoimidazol-2-yl)-(3-{3-[4-(1- hydroxy-1-methyl-ethyl)-piperidin-1-yl]- pyrazin-2-yl}-azetidin-1-yl)-methanone

1-{3-[1-(1H-Benzoimidazole-2-carbonyl)- azetidin-3-yl]-pyrazin-2-yl}-piperidine-4- carbonitrile

(1H-Benzoimidazol-2-yl)-{3-[3-(4- methoxymethyl-piperidin-1-yl)-pyrazin-2- yl]-azetidin-1-yl}-methanone

(R & S)-(1H-Benzoimidazol-2-yl)-{3-[3- (3-methyl-pyrrolidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(R & S)-(1H-Benzoimidazol-2-yl)-{3-[3- (2-methyl-pyrrolidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(3,4- dihydro-1H-isoquinolin-2-yl)-pyrazin-2- yl]-azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(1,3- dihydro-isoindol-2-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(R & S)-(1H-Benzoimidazol-2-yl)-{3-[3- (3-phenyl-pyrrolidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(R & S)-(1H-Benzoimidazol-2-yl)-{3-[3- (2-phenyl-pyrrolidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-[3-(3- cyclopentylamino-pyrazin-2-yl)-azetidin- 1-yl]-methanone

(1H-Benzoimidazol-2-yl)-[3-(3- cyclohexylamino-pyrazin-2-yl)-azetidin-1- yl]-methanone

(1H-Benzoimidazol-2-yl)-[3-(3- benzylamino-pyrazin-2-yl)-azetidin-1-yl]- methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(2- hydroxy-ethylamino)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(1H-benzo[d]imidazol-2-yl)(3-(3-((2- methoxyethyl)amino)pyrazin-2- yl)azetidin-1-yl)methanone

1-{3-[1-(1H-Benzoimidazole-2-carbonyl)- azetidin-3-yl]-pyrazin-2-yl}-piperidine-4- carboxylic acid amide

(R & S)-(1H-Benzoimidazol-2-yl)-{3-[3- (3-hydroxymethyl-piperidin-1-yl)-pyrazin- 2-yl]-azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(3- hydroxy-piperidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

[3-(3-Azepan-1-yl-pyrazin-2-yl)-azetidin- 1-yl]-(1H-benzoimidazol-2-yl)-methanone

[3-(3-Azetidin-1-yl-pyrazin-2-yl)-azetidin- 1-yl]-(1H-benzoimidazol-2-yl)-methanone

(R)-(1H-Benzoimidazol-2-yl)-{3-[3-(2- hydroxymethyl-pyrrolidin-1-yl)-pyrazin-2- yl]-azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-[3-(3- isopropylamino-pyrazin-2-yl)-azetidin-1- yl]-methanone

(S)-(1H-Benzoimidazol-2-yl)-{3-[3-(2- hydroxymethyl-pyrrolidin-1-yl)-pyrazin-2- yl]-azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-(3-{3-[4-(2- hydroxy-ethyl)-piperidin-1-yl]-pyrazin-2- yl}-azetidin-1-yl)-methanone

(1H-Benzoimidazol-2-yl)-[3-(3- [1,4]oxazepan-4-yl-pyrazin-2-yl)-azetidin- 1-yl]-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(4-methyl- [1,4]diazepan-1-yl)-pyrazin-2-yl]-azetidin- 1-yl}-methanone

1-(4-{3-[1-(1H-Benzoimidazole-2- carbonyl)-azetidin-3-yl]-pyrazin-2-yl}- [1,4]diazepan-1-yl)-ethanone

(1H-Benzoimidazol-2-yl)-{3-[3-(4- hydroxy-azepan-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(R & S)-(1H-Benzoimidazol-2-yl)-{3-[3- (3-hydroxymethyl-pyrrolidin-1-yl)- pyrazin-2-yl]-azetidin-1-yl}-methanone

(R)-(1H-Benzoimidazol-2-yl)-{3-[3-(3- hydroxy-piperidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(S)-(1H-Benzoimidazol-2-yl)-{3-[3-(3- hydroxy-piperidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(R & S)-1-{3-[1-(1H-Benzoimidazole-2- carbonyl)-azetidin-3-yl]-pyrazin-2-yl}- piperidine-3-carbonitrile

1-{3-[1-(1H-Benzoimidazole-2-carbonyl)- azetidin-3-yl]-pyrazin-2-yl}-piperidine-4- carboxylic acid methylamide

1-{3-[1-(1H-Benzoimidazole-2-carbonyl)- azetidin-3-yl]-pyrazin-2-yl}-piperidine-4- carboxylic acid dimethylamide

1-(1-(3-(1-(1H-benzo[d]imidazole-2- carbonyl)azetidin-3-yl)pyrazin-2- yl)piperidin-4-yl)ethanone

1-(4-(3-(1-(1H-benzo[d]imidazole-2- carbonyl)azetidin-3-yl)pyrazin-2- yl)piperazin-1-yl)ethanone

(R)-(1H-benzo[d]imidazol-2-yl)(3-(3-(3- hydroxypyrrolidin-1-yl)pyrazin-2- yl)azetidin-1-yl)methanone

(S)-(1H-benzo[d]imidazol-2-yl)(3-(3-(3- hydroxypyrrolidin-1-yl)pyrazin-2- yl)azetidin-1-yl)methanone

(1H-benzo[d]imidazol-2-yl)(3-(3- (piperidin-1-yl)pyrazin-2-yl)azetidin-1- yl)methanone

(1H-benzo[d]imidazol-2-yl)(3-(3-(4- hydroxypiperidin-1-yl)pyrazin-2- yl)azetidin-1-yl)methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(2-oxa-7- aza-spiro[3.5]non-7-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(2-oxa-6- aza-spiro[3.3]hept-6-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

1-(6-{3-[1-(1H-Benzoimidazole-2- carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-2,6- diaza-spiro[3.3]hept-2-yl)-ethanone

2-(3-(3-(2-methoxypyridin-3-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(6-methylpyridin-3-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(2-methylpyridin-3-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(6-fluoropyridin-3-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(6-(trifluoromethyl)pyridin-3- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

2-(3-(3-(2,6-dimethoxypyridin-3- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

2-(3-(3-(5-fluoropyridin-3-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(6-methoxypyridin-3-yl)pyrazin-2- yl)azetidin-1-yl)quinoline 2,2,2- trifluoroacetate

2-(3-(3-(6-fluoro-5-methylpyridin-3- yl)pyrazin-2-yl)azetidin-1-yl)quinoline 2,2,2-trifluoroacetate

2-(3-(3-(pyridin-3-yl)pyrazin-2- yl)azetidin-1-yl)quinoline 2,2,2- trifluoroacetate

2-(3-(3-(4- (methylsulfonyl)phenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 2,2,2- trifluoroacetate

5-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyridin-2-amine

5-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyridin-3-amine

2-(3-(3-(6-methoxypyridin-2-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(2-(trifluoromethyl)pyridin-3- yl)pyrazin-2-yl)azetidin-1-yl)quinoline 2,2,2-trifluoroacetate

N,N-dimethyl-5-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)pyrimidin-2- amine 2,2,2-trifluoroacetate

2-(3-(3-(4-methylpyridin-3-yl)pyrazin-2- yl)azetidin-1-yl)quinoline 2,2,2- trifluoroacetate

2-(3-(3-(5-(methylsulfonyl)pyridin-3- yl)pyrazin-2-yl)azetidin-1-yl)quinoline 2,2,2-trifluoroacetate

2-(3-(3-(5-methylpyridin-3-yl)pyrazin-2- yl)azetidin-1-yl)quinoline 2,2,2- trifluoroacetate

2-(3-(3-(5-methoxypyridin-3-yl)pyrazin-2- yl)azetidin-1-yl)quinoline 2,2,2- trifluoroacetate

2-(3-(3-(4-chloro-3-methylphenyl)pyrazin- 2-yl)azetidin-1-yl)quinoline

2-(3-(3-(3-fluoro-4-methylphenyl)pyrazin- 2-yl)azetidin-1-yl)quinoline

2-chloro-4-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)phenol

2-(3-(3-(3-methoxy-5- (trifluoromethyl)phenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(4-ethoxy-3-fluorophenyl)pyrazin- 2-yl)azetidin-1-yl)quinoline

2-(3-(3-(3-chloro-4-ethoxyphenyl)pyrazin- 2-yl)azetidin-1-yl)quinoline

2-(3-(3-(3-chloro-4- propoxyphenyl)pyrazin-2-yl)azetidin-1- yl)quinoline

2-(3-(3-(3-fluoro-5- (trifluoromethyl)phenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(4-methoxy-3- methylphenyl)pyrazin-2-yl)azetidin-1- yl)quinoline

2-(3-(3-(3-fluoro-5- isopropoxyphenyl)pyrazin-2-yl)azetidin-1- yl)quinoline

2-(3-(3-(3-fluoro-5-methylphenyl)pyrazin- 2-yl)azetidin-1-yl)quinoline

2-(3-(3-(3-chloro-4-fluorophenyl)pyrazin- 2-yl)azetidin-1-yl)quinoline

2-(3-(3-(3,4-difluorophenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(3,4-dichlorophenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(3,4-dimethylphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(3-chloro-4-methylphenyl)pyrazin- 2-yl)azetidin-1-yl)quinoline

2-(3-(3-(3-chloro-5-methylphenyl)pyrazin- 2-yl)azetidin-1-yl)quinoline

2-(3-(3-(4-fluoro-3-methylphenyl)pyrazin- 2-yl)azetidin-1-yl)quinoline

2-(3-(3-(pyrimidin-5-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(4-chloro-3- (trifluoromethyl)phenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(3,6-dihydro-2H-pyran-4- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

2-(3-(3-(2,2-dimethyl-3,6-dihydro-2H- pyran-4-yl)pyrazin-2-yl)azetidin-1- yl)quinoline and 2-(3-(3-(6,6-dimethyl-3,6- dihydro-2H-pyran-4-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(1H-pyrazol-4-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(3-fluoro-5- (trifluoromethyl)phenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(6-methoxypyridin-2-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-phenylpyrazin-2-yl)azetidin-1- yl)quinoline

2-(3-(3-(4-methoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(4-fluorophenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(2-fluorophenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(3-fluorophenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(pyridin-4-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

3-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)benzonitrile

4-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)benzonitrile

methyl 3-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)benzoate

ethyl 4-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)benzoate

2-(3-(3-(2-methoxypyridin-4-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(2-fluoropyridin-4-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(3-(methylthio)phenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

1-(4-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)phenyl)ethanone

2-(3-(3-(4-phenoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(4- (trifluoromethyl)phenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(3-fluoro-4- methoxyphenyl)pyrazin-2-yl)azetidin-1- yl)quinoline

N,N-dimethyl-3-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)aniline

N-methyl-3-(3-(1-(quinolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)benzamide

tert-butyl 4-(3-(1-(quinolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)-5,6-dihydropyridine- 1(2H)-carboxylate

2-(3-(3-([1,1′-biphenyl]-3-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-fluoro-4-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)benzonitrile

2-fluoro-5-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)benzonitrile

N,N-dimethyl-3-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)benzamide

2-(3-(3-(2-methoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(3- (trifluoromethyl)phenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(3-ethoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

1-(3-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)phenyl)ethanone

(3-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)phenyl)methanol

2-(3-(3-(3- (trifluoromethoxy)phenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(3-(benzyloxy)phenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

N-cyclopropyl-3-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)benzamide

N,N-dimethyl-3-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)benzenesulfonamide

2-(3-(3-(4-ethoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

(4-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)phenyl)methanol

2-(3-(3-(4-propylphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(4-ethylphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

N,N-dimethyl-4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)aniline

2-(3-(3-(4- (trifluoromethoxy)phenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(4-isopropoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-methyl-2-(4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)phenyl)propanenitrile

4-((4-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2- yl)phenyl)sulfonyl)morpholine

2-(3-(3-(4-(piperidin-1- ylsulfonyl)phenyl)pyrazin-2-yl)azetidin-1- yl)quinoline

(R- & S-)-2-(3-(3-(3-(pyridin-3- yl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1- yl)quinoline

(R- & S-)-2-(3-(3-(3-phenethylpyrrolidin- 1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline

(R- & S-)-2-(3-(3-(3-benzylpyrrolidin-1- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

(R)-N,N-dimethyl-1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3- amine

(R- & S-)-tert-butyl methyl(1-(3-(1- (quinolin-2-yl)azetidin-3-yl)pyrazin-2- yl)pyrrolidin-3-yl)carbamate

(R- & S-)-N,N-dimethyl-1-(3-(1-(quinolin- 2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin- 3-amine

2-(3-(3-(3-azabicyclo[3.1.0]hexan-3- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

(R- & S-)-2-(3-(3-(3- (phenylsulfonyl)pyrrolidin-1-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

(R- & S-)-3-methyl-5-(1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3- yl)-1,2,4-oxadiazole

(R)-1-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-3-ol

(R- & S-)-2-(3-(3-(3-(pyridin-4- yl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1- yl)quinoline

2-(3-(3-(pyrrolidin-1-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

(3aR,6aS)-tert-butyl 5-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)hexahydropyrrolo[3,4-c]pyrrole-2(1H)- carboxylate

tert-butyl 5-(3-(1-(quinolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)hexahydropyrrolo[3,4- c]pyrrole-2(1H)-carboxylate

tert-butyl 4-(3-(1-(quinolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)-1,4-diazepane-1- carboxylate

(R)-(1-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-3-yl)methanol

(R- & S-)-2-(3-(3-(3- (methylsulfonyl)pyrrolidin-1-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

(S)-(1-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-3-yl)methanol

(R)-tert-butyl 1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3- ylcarbamate

(S)-2-(3-(3-(3-fluoropyrrolidin-1- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

2-(3-(3-(3,3-difluoropyrrolidin-1- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

2-(3-(3-(4-isopropyl-1,4-diazepan-1- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

(1R,5R)-3-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)-3-azabicyclo[3.2.2]nonane

2-(3-(3-(azepan-1-yl)pyrazin-2-yl)azetidin- 1-yl)quinoline

2-(3-(3-(4-methyl-1,4-diazepan-1- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

3-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)-3-azabicyclo[3.2.2]nonane

1-(4-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)-1,4-diazepan-1- yl)ethanone

(R- & S-)-2-(3-(3-(3-phenylpyrrolidin-1- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

(3S,4S)-1-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidine-3,4-diol

N-(4-methoxybenzyl)-3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-amine

(1R,4R)-5-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)-2-oxa-5- azabicyclo[2.2.1]heptane

(R- & S-)-2-(1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3- yl)thiazole

(S)-(1-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-2-yl)methanol

((2S,4S)-4-fluoro-1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-2- yl)methanol

(R)-2-(3-(3-(2-(methoxymethyl)pyrrolidin- 1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline

2-(3-(3-(hexahydrocyclopenta[c]pyrrol- 2(1H)-yl)pyrazin-2-yl)azetidine-1- yl)quinoline

(R- & S-)-2-(3-(3-(3-isobutylpyrrolidin-1- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

2-(3-(3-(3,3-dimethylpyrrolidin-1- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

(R- & S-)-2-(3-(3-(3- (methoxymethyl)pyrrolidin-1-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(4-(trifluoromethyl)piperidin-1- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

1-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4-carbonitrile

2-(3-(3-(4,4-difluoropiperidin-1- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

4-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)morpholine

2-(3-(3-(4-fluoropiperidin-1-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-(3-(3-(3-methoxyazetidin-1-yl)pyrazin- 2-yl)azetidin-1-yl)quinoline

2-(3-(3-(3,3-difluoroazetidin-1-yl)pyrazin- 2-yl)azetidin-1-yl)quinoline

4-methyl-1-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidin-4-ol

1-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)-1H-pyrazole-4- carbonitrile

2-(3-(3-(4-methyl-1H-pyrazol-1- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

tert-butyl (1-(3-(1-(quinolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)azetidin-3-yl)carbamate

2,2-dimethyl-4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)morpholine

2-(3-(3-(4-methyl-1H-imidazol-1- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

1-(3-(1-(quinazolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4-carbonitrile

(1-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)-1H-pyrazol-4-yl)methanol

(1-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)-1H-imidazol-4- yl)methanol

1-methyl-4-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperazin-2-one

N-(2,6-dimethylphenyl)-1-(3-(1-(quinolin- 2-yl)azetidin-3-yl)pyrazin-2-yl)piperidine- 3-carboxamide

(S)-tert-butyl (1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)piperidin-3- yl)carbamate

(4-(cyclopropylmethyl)-1-(3-(1-(quinolin- 2-yl)azetidin-3-yl)pyrazin-2-yl)piperidin- 4-yl)methanol

2-(3-(3-((1R,5S)-8-methyl-3,8- diazabicyclo[3.2.1]octan-3-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

1-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-3-amine

(R- & S-)-methyl (1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3- yl)carbamate

(R- & S-)-N-(1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3- yl)methanesulfonamide

(R- & S-)-ethyl (1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3- yl)carbamate

(R- & S-)-2-methoxy-N-(1-(3-(1-(quinolin- 2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin- 3-yl)acetamide

2-(3-(3-(1,4-Diazepan-1-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

Methyl 4-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)-1,4-diazepane-1- carboxylate

methyl methyl(1-(3-(1-quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3- yl)carbamate

N-methyl-N-(1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3- yl)methanesulfonamide

Ethyl methyl(1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3- yl)carbamate

2-(3-(3-(4-chlorophenyl)pyrazin-2- yl)azetidin-1-yl)quinazoline

2-(3-(3-(3-chlorophenyl)pyrazin-2- yl)azetidin-1-yl)quinazoline

2-(3-(3-(2-chlorophenyl)pyrazin-2- yl)azetidin-1-yl)quinazoline

2-(3-(3-(o-tolyl)pyrazin-2-yl)azetidin-1- yl)quinazoline

1-(4-(3-(1-(quinazolin-2-yl)azetidin-3- yl)pyrazin-2-yl)phenyl)ethanone

1-(3-(3-(1-(quinazolin-2-yl)azetidin-3- yl)pyrazin-2-yl)phenyl)ethanone

N-(3-(3-(1-(quinazolin-2-yl)azetidin-3- yl)pyrazin-2-yl)phenyl)acetamide

N-(4-(3-(1-(quinazolin-2-yl)azetidin-3- yl)pyrazin-2- yl)phenyl)methanesulfonamide

N-(3-(3-(1-(quinazolin-2-yl)azetidin-3- yl)pyrazin-2- yl)phenyl)methanesulfonamide

2-(3-(3-(1H-indol-6-yl)pyrazin-2- yl)azetidin-1-yl)quinazoline

2-(3-(3-(1-methyl-1H-indol-5-yl)pyrazin- 2-yl)azetidin-1-yl)quinazoline

2-(3-(3-(1-methyl-1H-indol-6-yl)pyrazin- 2-yl)azetidin-1-yl)quinazoline

5-(3-(1-(quinazolin-2-yl)azetidin-3- yl)pyrazin-2-yl)indolin-2-one

1-methyl-5-(3-(1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2-yl)indolin-2-one

1-methyl-6-(3-(1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2-yl)-1H- benzo[d]imidazol-2(3H)-one

2-fluoro-4-(3-(1-(quinazolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)aniline

2-(3-(3-(p-tolyl)pyrazin-2-yl)azetidin-1- yl)quinazoline

2-methyl-6-(3-(1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2-yl)isoquinolin- 1(2H)-one

2-(3-(3-(1H-indazol-5-yl)pyrazin-2- yl)azetidin-1-yl)quinazoline

5-(3-(1-(quinazolin-2-yl)azetidin-3- yl)pyrazin-2-yl)benzo[d]thiazole

(R & S)-(1H-Benzoimidazol-2-yl)-(3-{3- [4-(1-hydroxy-ethyl)-phenyl]-pyrazin-2- yl}-azetidin-1-yl)-methanone

(R & S)-(1H-Benzoimidazol-2-yl)-(3-{3- [3-(1-hydroxy-ethyl)-phenyl]-pyrazin-2- yl}-azetidin-1-yl)-methanone

(R & S)-(1H-Benzoimidazol-2-yl)-(3-{3- [4-(1-hydroxy-ethyl)-piperidin-1-yl]- pyrazin-2-yl}-azetidin-1-yl)-methanone

1-(4-{3-[1-(1H-Benzoimidazole-2- carbonyl)-azetidin-3-yl]-pyrazin-2-yl}- piperidin-1-yl)-ethanone

1-{3-[1-(1H-Benzoimidazole-2-carbonyl)- azetidin-3-yl]-pyrazin-2-yl}-piperidin-4- one

(1H-Benzoimidazol-2-yl)-{3-[3-(4,4- difluoro-piperidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(4- hydroxy-4-methyl-piperidin-1-yl)-pyrazin- 2-yl]-azetidin-1-yl}-methanone

(1H-Benzoimidazol-2-yl)-[3-(5-phenyl- pyrimidin-4-yl)-azetidin-1-yl]-methanone

2-(3-(3-(prop-1-yn-1-yl)pyrazin-2- yl)azetidin-1-yl)quinoline

2-[3-(3-m-Tolyl-pyrazin-2-yl)-azetidin-1- yl]-quinoline

2-[3-(3-m-Tolyl-pyrazin-2-yl)-azetidin-1- yl]-quinazoline

2-[3-(3-m-Tolyl-pyrazin-2-yl)-azetidin-1- yl]-quinoxaline

2-[3-(3-m-Tolyl-pyrazin-2-yl)-azetidin-1- yl]-benzothiazole

2-{3-[3-(3-Methoxy-phenyl)-pyrazin-2- yl]-azetidin-1-yl}-quinoline

2-{3-[3-(3-Methoxy-phenyl)-pyrazin-2- yl]-azetidin-1-yl}-quinazoline

2-{3-[3-(3-Methoxy-phenyl)-pyridin-2-yl]- azetidin-1-yl}-quinoline

2-[3-(3-m-Tolyl-pyridin-2-yl)-azetidin-1- yl]-quinoline

(R & S)-2-{3-[3-(3-Methyl-pyrrolidin-1- yl)-pyridin-2-yl]-azetidin-1-yl}-quinoline

4-Methyl-2′-(1-quinolin-2-yl-azetidin-3- yl)-3,4,5,6-tetrahydro-2H-[1,3′]bipyridinyl

{1-[3-(1-Quinolin-2-yl-piperidin-4-yl)- pyrazin-2-yl]-piperidin-4-yl}-methanol

{1-[3-(1-Quinolin-2-yl-azetidin-3-yl)- pyrazin-2-yl]-piperidin-4-yl}-methanol

{1-[3-(1-Quinazolin-2-yl-azetidin-3-yl)- pyrazin-2-yl]-piperidin-4-yl}-methanol

4-[3-(1-Quinolin-2-yl-azetidin-3-yl)- pyrazin-2-yl]-phenylamine

{1-[3-(1-Benzothiazol-2-yl-azetidin-3-yl)- pyrazin-2-yl]-piperidin-4-yl}-methanol

{1-[3-(1-Benzooxazol-2-yl-azetidin-3-yl)- pyrazin-2-yl]-piperidin-4-yl}-methanol

(1-{3-[1-(5-Methyl-pyridin-2-yl)-azetidin- 3-yl]-pyrazin-2-yl}-piperidin-4-yl)- methanol

2-(4-benzylpiperidin-1-yl)-3-(1-(quinolin- 2-yl)azetidin-3-yl)quinoxaline

[5′-Fluoro-2′-(1-quinolin-2-yl-azetidin-3- yl)-3,4,5,6-tetrahydro-2H- [1,3′]bipyridinyl-4-yl]-methanol

{1-[3-(1-Quinolin-2-yl-azetidin-3-yl)- pyridazin-4-yl]-piperidin-4-yl}-methanol

(R & S)-2-(3-(3-(3-methylpyrrolidin-1- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

(S or R)-2-(3-(3-(3-methylpyrrolidin-1- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

(R or S)-2-(3-(3-(3-methylpyrrolidin-1- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

2-(1-Quinolin-2-yl-azetidin-3-yl)-3-m- tolyl-quinoxaline

4-[3-(1-Quinolin-2-yl-azetidin-3-yl)- quinoxalin-2-yl]-phenylamine

3-[3-(1-Quinolin-2-yl-azetidin-3-yl)- quinoxalin-2-yl]-phenol

2-(3-Methoxy-phenyl)-3-(1-quinolin-2-yl- azetidin-3-yl)-quinoxaline

2-[3-(1-Quinolin-2-yl-azetidin-3-yl)- pyrazin-2-yl]-phenol

3-[3-(1-Quinolin-2-yl-azetidin-3-yl)- pyrazin-2-yl]-phenol

4-[3-(1-Quinolin-2-yl-azetidin-3-yl)- pyrazin-2-yl]-phenol

2-[3-(1-Quinolin-2-yl-azetidin-3-yl)- pyrazin-2-yl]-phenylamine

3-[3-(1-Quinolin-2-yl-azetidin-3-yl)- pyrazin-2-yl]-phenylamine

4-[3-(1-Quinolin-2-yl-azetidin-3-yl)- pyrazin-2-yl]-phenylamine

2-{3-[3-(4-Fluoro-3-methoxy-phenyl)- pyrazin-2-yl]-azetidin-1-yl}-quinoline

2-Fluoro-4-[3-(1-quinolin-2-yl-azetidin-3- yl)-pyrazin-2-yl]-phenylamine

2-[3-(3-Piperidin-1-yl-pyrazin-2-yl)- azetidin-1-yl]-quinoline

2-{3-[3-(4-Methyl-piperidin-1-yl)-pyrazin- 2-yl]-azetidin-1-yl}-quinoline

1-[3-(1-Quinolin-2-yl-azetidin-3-yl)- pyrazin-2-yl]-piperidine-4-carboxylic acid amide

1-[3-(1-Quinolin-2-yl-azetidin-3-yl)- pyrazin-2-yl]-piperidine-4-carboxylic acid dimethylamide

1-[3-(1-Quinolin-2-yl-azetidin-3-yl)- pyrazin-2-yl]-piperidine-4-carboxylic acid methylamide

1-[3′-(1-Quinolin-2-yl-azetidin-3-yl)- 2,3,5,6-tetrahydro-[1,2′]bipyrazinyl-4-yl]- ethanone

1-[3-(1-Quinolin-2-yl-azetidin-3-yl)- pyrazin-2-yl]-piperidin-4-ol

2-Methoxy-1-{4-[3-(1-quinolin-2-yl- azetidin-3-yl)-pyrazin-2-yl]-piperidin-1- yl}-ethanone

1-{4-[3-(1-Quinolin-2-yl-azetidin-3-yl)- pyrazin-2-yl]-piperidin-1-yl}-ethanone

N-{4-[3-(1-Quinolin-2-yl-azetidin-3-yl)- pyrazin-2-yl]-phenyl}-acetamide

1-(4-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)-5,6-dihydropyridin-1(2H)- yl)ethanone

(R & S)-1-{1-[3-(1-Quinolin-2-yl-azetidin- 3-yl)-pyrazin-2-yl]-piperidin-4-yl}-ethanol

(R or S, absolute stereospecificity not determined)-1-{1-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyrazin-2-yl]-piperidin-4- yl}-ethanol

2-fluoro-5-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)phenol

(1-{3-[1-(6-Methyl-quinolin-2-yl)- azetidin-3-yl]-pyrazin-2-yl}-piperidin-4- yl)-methanol

(1-{3-[1-(7-Fluoro-quinolin-2-yl)-azetidin- 3-yl]-pyrazin-2-yl}-piperidin-4-yl)- methanol

(1-{3-[1-(6-Fluoro-quinolin-2-yl)-azetidin- 3-yl]-pyrazin-2-yl}-piperidin-4-yl)- methanol

{1-[3-(1-[1,8]Naphthyridin-2-yl-azetidin- 3-yl)-pyrazin-2-yl]-piperidin-4-yl}- methanol

(1-{3-[1-(6-Chloro-quinolin-2-yl)-azetidin- 3-yl]-pyrazin-2-yl}-piperidin-4-yl)- methanol

(1-{3-[1-(6-Chloro-quinoxalin-2-yl)- azetidin-3-yl]-pyrazin-2-yl}-piperidin-4- yl)-methanol

(1-{3-[1-(6-Methyl-pyridin-2-yl)-azetidin- 3-yl]-pyrazin-2-yl}-piperidin-4-yl)- methanol

(1-{3-[1-(5-Chloro-pyridin-2-yl)-azetidin- 3-yl]-pyrazin-2-yl}-piperidin-4-yl)- methanol

(1-(3-(1-(5-bromopyridin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidin-4-yl)methanol

(1-(3-(1-(8-methylquinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidin-4-yl)methanol

(1-{3-[1-(8-Fluoro-quinolin-2-yl)-azetidin- 3-yl]-pyrazin-2-yl}-piperidin-4-yl)- methanol

(1-(3-(1-(8-chloroquinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidin-4-yl)methanol

(1-{3-[1-(8-Chloro-quinazolin-2-yl)- azetidin-3-yl]-pyrazin-2-yl}-piperidin-4- yl)-methanol

(1-{3-[1-(7-Chloro-quinazolin-2-yl)- azetidin-3-yl]-pyrazin-2-yl}-piperidin-4- yl)-methanol

(1-{3-[1-(6-Chloro-quinazolin-2-yl)- azetidin-3-yl]-pyrazin-2-yl}-piperidin-4- yl)-methanol

(1-{3-[1-(5-Chloro-quinazolin-2-yl)- azetidin-3-yl]-pyrazin-2-yl}-piperidin-4- yl)-methanol

(1-{3-[1-(7-Chloro-quinoxalin-2-yl)- azetidin-3-yl]-pyrazin-2-yl}-piperidin-4- yl)-methanol

2-[3-(3-Piperidin-1-yl-pyrazin-2-yl)- azetidin-1-yl]-benzothiazole

2-(3-(3-(3-methoxyphenyl)pyrazin-2- yl)azetidin-1-yl)-8-methylquinoline

6-Chloro-2-{3-[3-(3-methoxy-phenyl)- pyrazin-2-yl]-azetidin-1-yl}-quinazoline

8-Chloro-2-{3-[3-(3-methoxy-phenyl)- pyrazin-2-yl]-azetidin-1-yl}-quinoline

7-Fluoro-2-{3-[3-(3-methoxy-phenyl)- pyrazin-2-yl]-azetidin-1-yl}-quinoline

2-{3-[3-(3-Methoxy-phenyl)-pyrazin-2- yl]-azetidin-1-yl}-6-methyl-quinoline

2-{3-[3-(3-Methoxy-phenyl)-pyrazin-2- yl]-azetidin-1-yl}-[1,8]naphthyridine

8-Chloro-2-{3-[3-(3-methoxy-phenyl)- pyrazin-2-yl]-azetidin-1-yl}-quinazoline

5-Chloro-2-{3-[3-(3-methoxy-phenyl)- pyrazin-2-yl]-azetidin-1-yl}-quinazoline

2-(3-(3-(3-methoxyphenyl)pyrazin-2- yl)azetidin-1-yl)-4-phenylpyrimidine

2-(3-(3-(3-methoxyphenyl)pyrazin-2- yl)azetidin-1-yl)benzo[d]thiazole

6-methoxy-2-(3-(3-(3- methoxyphenyl)pyrazin-2-yl)azetidin-1- yl)benzo[d]thiazole

2-(3-(3-(3-methoxyphenyl)pyrazin-2- yl)azetidin-1-yl)-1,6-naphthyridine

6-chloro-2-(3-(3-(3- methoxyphenyl)pyrazin-2-yl)azetidin-1- yl)quinoline

6-fluoro-2-(3-(3-(3- methoxyphenyl)pyrazin-2-yl)azetidin-1- yl)benzo[d]thiazole

2-(3-(3-(3-methoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline-3-carbonitrile

1-[3-(3-Phenyl-pyrazin-2-yl)-azetidin-1- yl]-phthalazine

6-chloro-2-(3-(3-phenylpyrazin-2- yl)azetidin-1-yl)-1H-benzo[d]imidazole

2-(3-(3-phenylpyrazin-2-yl)azetidin-1-yl)- 1H-benzo[d]imidazole

2-((3-(3-phenylpyrazin-2-yl)azetidin-1- yl)methyl)-1H-benzo[d]imidazole

3-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)benzamide

4-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)benzamide

2-fluoro-5-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)benzamide

2-fluoro-4-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)benzamide

2-(3-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)phenyl)propan-2-ol

2-(4-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)phenyl)propan-2-ol

2-(3-(3-(1,2,3,6-tetrahydropyridin-4- yl)pyrazin-2-yl)azetidin-1-yl)quinoline

lithium 3-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)benzoate

(S or R)-2-(3-(3-(3-(pyridin-3- yl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1- yl)quinoline

(R or S)-2-(3-(3-(3-(pyridin-3- yl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1- yl)quinoline

(1H-Benzoimidazol-2-yl)-{3-[3-(2- methoxy-phenoxy)-pyrazin-2-yl]-azetidin- 1-yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(3- methoxy-phenoxy)-pyrazin-2-yl]-azetidin- 1-yl}-methanone

(1H-benzoimidazol-2-yl)-{3-[3-(4- methoxy-phenoxy)-pyrazin-2-yl]-azetidin- 1-yl}-methanone

(1H-Benzoimidazol-2-yl)-[3-(3-phenoxy- pyrazin-2-yl)-azetidin-1-yl]-methanone

(1H-benzoimidazol-2-yl)-{3-[3- (tetrahydro-pyran-4-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone

(7-Chloro-1H-benzoimidazol-2-yl)-[3-(3- phenyl-pyrazin-2-yl)-azetidin-1-yl]- methanone

(6-Chloro-1H-benzoimidazol-2-yl)-[3-(3- phenyl-pyrazin-2-yl)-azetidin-1-yl]- methanone

(7-F luoro-1H-benzoimidazol-2-yl)-[3-(3- phenyl-pyrazin-2-yl)-azetidin-1-yl]- methanone

(6-F luoro-1H-benzoimidazol-2-yl)-[3-(3- phenyl-pyrazin-2-yl)-azetidin-1-yl]- methanone

(6-methyl-1H-benzoimidazol-2-yl)-[3-(3- phenyl-pyrazin-2-yl)-azetidin-1-yl]- methanone

(6-methyl-1H-benzoimidazol-2-yl)-[3-(3- phenyl-pyrazin-2-yl)-azetidin-1-yl]- methanone

(1H-benzoimidazol-2-yl)-{3-[3-(2- methoxy-phenyl)-pyrazin-2-yl]-azetidin-1- yl}-methanone

(1H-benzoimidazol-2-yl)-{3-[3-(3- methoxy-phenyl)-pyrazin-2-yl]-azetidin-1- yl}-methanone

(1H-Benzoimidazol-2-yl)-{3-[3-(4- methoxy-phenyl)-pyrazin-2-yl]-azetidin-1- yl}-methanone

(1H-benzoimidazol-2-yl)-[3-(2-phenyl- pyridin-3-yl)-azetidin-1-yl]-methanone

2-(3-(3-(1H-indol-5-yl)pyrazin-2- yl)azetidin-1-yl)quinazoline

Another aspect of the invention relates to the compounds of Examples 36.1 to 36.190 as listed in Table 36 below, or a pharmaceutically acceptable salt thereof.

Yet another aspect of the current invention relates to any compound of the present invention, or a pharmaceutically-acceptable salt thereof, radiolabeled with a positron emitting radionuclide selected from ¹¹C, ¹⁸F, ¹⁵O, ¹³N, ⁷⁶Br, ⁷⁷Br, ¹²³I, or ¹²⁵I.

Yet another aspect of the current invention relates to a radiopharmaceutical composition comprising any compound of the present invention, or a pharmaceutically-acceptable salt thereof, radiolabeled with a positron emitting radionuclide selected from ¹¹C, ¹⁸F, ¹⁵O, ¹³N, ⁷⁶Br, ⁷⁷Br, ¹²³I, or ¹²⁵I, and at least one pharmaceutically acceptable carrier or excipient.

Yet another aspect of the current invention relates to a method for the diagnostic imaging of PDE10 receptors in a mammal, including human, or tissues bearing PDE10 receptors in a mammal, including human brain, which comprises administering to a mammal in need of such diagnostic imaging an effective amount of any compound of the present invention, or a pharmaceutically-acceptable salt thereof, radiolabeled with a positron emitting radionuclide selected from ¹¹C, ¹⁸F, ¹⁵O, ¹³N, ⁷⁶Br, ⁷⁷Br, ¹²³I, or ¹²⁵I.

Yet another aspect of the current invention relates to a method for the diagnostic imaging of PDE10 receptors in a mammal, including human, or tissues bearing PDE10 receptors in a mammal, including human brain, which comprises administering to a mammal in need of such diagnostic imaging an effective amount of any compound of the present invention, or a pharmaceutically-acceptable salt thereof, radiolabeled with a positron emitting radionuclide selected from ¹¹C, ¹⁸F, ¹⁵O, ¹³N, ⁷⁶Br, ⁷⁷Br, ¹²³I, or ¹²⁵I.

Yet another aspect of the current invention relates to a method for the detection or quantification of PDE10 receptors in mammalian tissue, including human tissue, which comprises contacting such mammalian tissue in which such detection or quantification is desired with an effective amount of any compound of the present invention, or a pharmaceutically-acceptable salt thereof, radiolabeled with a positron emitting radionuclide selected from ¹¹C, ¹⁸F, ¹⁵O, ¹³N, ⁷⁶Br, ⁷⁷Br, ¹²³I, or ¹²⁵I.

The compounds of this invention may have in general several asymmetric centers and are typically depicted in the form of racemic mixtures. This invention is intended to encompass racemic mixtures, other racemic mixtures and separate enantiomers and diasteromers.

The present invention includes all pharmaceutically acceptable isotopically-labelled compounds of the present invention wherein one or more atoms are replaced by atoms having the same atomic number, but an atomic mass or mass number different from the atomic mass or mass number which predominates in nature.

Examples of isotopes suitable for inclusion in the compounds of the invention include, but are not limited to, isotopes of hydrogen, such as ²H and ³H, carbon, such as ¹¹C, ¹³C and ¹⁴C, chlorine, such as ³⁸Cl, fluorine, such as ¹⁸F, iodine, such as ¹²³I and ¹²⁵I, nitrogen, such as ¹³N and ¹⁵N, oxygen, such as ¹⁵O, ¹⁷O and ¹⁸O, phosphorus, such as ³²P, and sulphur, such as ³⁵S.

Certain isotopically-labelled compounds of the present invention, for example, those incorporating a radioactive isotope, are useful in drug and/or substrate tissue distribution studies. The radioactive isotopes tritium, i.e. ³H, and carbon-14, i.e. ¹⁴C, are particularly useful for this purpose in view of their ease of incorporation and ready means of detection.

Substitution with heavier isotopes such as deuterium, i.e. ²H, may afford certain therapeutic advantages resulting from greater metabolic stability, for example, increased in vivo half-life or reduced dosage requirements, and hence may be preferred in some circumstances.

Substitution with positron emitting isotopes, such as ¹¹C, ¹⁸F, ¹⁵O and ¹³N, can be useful in Positron Emission Topography (PET) studies for examining substrate receptor occupancy.

Isotopically-labeled compounds of the present invention can generally be prepared by conventional techniques known to those skilled in the art or by processes analogous to those described in the accompanying Examples and Preparations using an appropriate isotopically-labeled reagent in place of the non-labeled reagent previously employed.

Pharmaceutically acceptable solvates in accordance with the invention include those wherein the solvent of crystallization may be isotopically substituted, e.g. D₂O, d₆-acetone, d₆-DMSO.

Specific embodiments of the present invention include the compounds exemplified in the Examples below and their pharmaceutically acceptable salts, complexes, solvates, polymorphs, stereoisomers, metabolites, prodrugs, and other derivatives thereof, Unless otherwise specified, the following definitions apply to terms found in the specification and

The term “C_(α-β)alk” means an alkyl group comprising a minimum of α and a maximum of β carbon atoms in a branched, cyclical or linear relationship or any combination of the three, wherein α and β represent integers. The alkyl groups described in this section may also contain one or two double or triple bonds. A designation of C₀alk indicates a direct bond. Examples of C₁₋₆alkyl include, but are not limited to the following:

The term “benzo group”, alone or in combination, means the divalent radical C₄H₄═, one representation of which is —CH═CH—CH═CH—, that when vicinally attached to another ring forms a benzene-like ring—for example tetrahydronaphthylene, indole and the like.

The terms “oxo” and “thioxo” represent the groups ═O (as in carbonyl) and ═S (as in thiocarbonyl), respectively.

The term “halo” or “halogen” means a halogen atoms selected from F, Cl, Br or I.

The term “C_(α-β)haloalk” means an alk group, as described above, wherein one or more hydrogen atom of the alk group is replaced by F, Cl, Br or I.

The term “carbon-linked” means a substituent is linked to another group through a carbon atom. Examples of “carbon-linked” substituents include, but are not limited to the following:

The term “nitrogen-linked” means a substituent is linked to another group through a nitrogen atom. Examples of “nitrogen-linked” substituents include, but are not limited to the following:

The group N(R^(a))R^(a) and the like include substituents where the two R^(a) groups together form a ring, optionally including a N, O or S atom, and include groups such as:

The group N(C_(α-β)alk) C_(α-β)alk, wherein α and β are as defined above, include substituents where the two C_(α-β)alk groups together form a ring, optionally including a N, O or S atom, and include groups such as:

The term “carbocyclyl” means a ring comprising by itself or in combination with other terms, represents, unless otherwise stated, cyclic version of “C_(α-β)alk”. Thus, the term “carbocyclyl” is meant to be included in the terms “C_(α-β)alk”. Examples of carbocycle include cyclopentyl, cyclohexyl, or partially unsaturated ring such as 1-cyclohexenyl, 3-cyclohexenyl, cycloheptyl, cyclobutylene, cyclohexylene and the like. Unless otherwise stated, carbocycle can include fully unsaturated ring such as phenyl or naphthyl.

The term “heteroatom” means N, O and S.

The term “heterocyclyl” means a ring comprising at least one carbon atom and at least one other atom selected from N, O and S. “Heterocyclyl” includes aromatic heterocyclic ring which is commonly known as heteroaryl. Thus, the term “heteroaryl” is meant to be included in the terms “heterocyclyl”. Examples of heterocycles that may be found in the claims include, but are not limited to, the following:

The term “pharmaceutically acceptable salt” means a salt prepared by conventional means, and are well known by those skilled in the art. The “pharmacologically acceptable salts” include basic salts of inorganic and organic acids, including but not limited to hydrochloric acid, hydrobromic acid, sulfuric acid, phosphoric acid, methanesulfonic acid, ethanesulfonic acid, malic acid, acetic acid, oxalic acid, tartaric acid, citric acid, lactic acid, fumaric acid, succinic acid, maleic acid, salicylic acid, benzoic acid, phenylacetic acid, mandelic acid and the like. When compounds of the invention include an acidic function such as a carboxy group, then suitable pharmaceutically acceptable cation pairs for the carboxy group are well known to those skilled in the art and include alkaline, alkaline earth, ammonium, quaternary ammonium cations and the like. For additional examples of “pharmacologically acceptable salts,” and Berge et al., J. Pharm. Sci. 66:1 (1977).

The term “saturated, partially-saturated or unsaturated” includes substituents saturated with hydrogens, substituents completely unsaturated with hydrogens and substituents partially saturated with hydrogens.

Representative examples of “saturated, partially-saturated or unsaturated” five to eight membered rings, optionally having one to three heteroatoms, are cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl and phenyl. Further exemplary five membered rings are furyl, thienyl, pyrrolyl, 2-pyrrolinyl, 3-pyrrolinyl, pyrrolidinyl, 1,3-dioxolanyl, oxazolyl, thiazolyl, imidazolyl, 2H-imidazolyl, 2-imidazolinyl, imidazolidinyl, pyrazolyl, 2-pyrazolinyl, pyrazolidinyl, isoxazolyl, isothiazolyl, 1,2-dithiolyl, 1,3-dithiolyl, 3H-1,2-oxathiolyl, 1,2,3-oxadiazolyl, 1,2,4-oxadiazolyl, 1,2,5-oxadiazolyl, 1,3,4oxadiazolyl, 1,2,3-triazolyl, 1,2,4-trizaolyl, 1,3,4-thiadiazolyl, 3H-1,2,3-dioxazolyl, 1,2,4-dioxazolyl, 1,3,2-dioxazolyl, 1,3,4-dioxazolyl, 5H-1,2,5-oxathiazolyl, and 1,3-oxathiolyl.

Further exemplary six membered rings are 2H-pyranyl, 4H-pyranyl, pyridinyl, piperidinyl, 1,2-dioxinyl, 1,3-dioxinyl, 1,4-dioxanyl, morpholinyl, 1,4-dithianyl, thiomorpholinyl, puradazinyl, pyrimidinyl, pyrazinyl, piperazinyl, 1,3,5-triazinyl, 1,2,4-triazinyl, 1,2,3-triazinyl, 1,3,5-trithianyl, 4H-1,2-oxazinyl, 2H-1,3-oxazinyl, 6H-1,3-oxazinyl, 6H-1,2-oxazinyl, 1,4-oxazinyl, 2H-1,2-oxazinyl, 4H-1,4-oxazinyl, 1,2,5-oxathiazinyl, 1,4-oxazinyl, o-isoxazinyl, p-isoxazinyl, 1,2,5-oxathiazinyl, 1,2,6-oxathiazinyl, and 1,4,2-oxadiazinyl.

Further exemplary seven membered rings are azepinyl, oxepinyl, thiepinyl and 1,2,4-triazepinyl.

Further exemplary eight membered rings are cyclooctyl, cyclooctenyl and cyclooctadienyl.

The term “monocyclic” means a group having a single saturated, partially saturated, or fully-unsaturated ring system. Typically a monocyclic ring system can have from 3- to 8 atoms in the ring system. The term includes, but is not limited to, cyclopropyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, phenyl, and the like.

The term “bicyclic” means a group having two interconnected saturated, partially saturated, or fully-unsaturated rings that include stable bridged, fused, or spiro rings. The bicyclic ring may be attached at any carbon or heteroatom which affords a stable group. Typically a bicyclic ring system can have from 6- to 14 atoms in the ring system. The term includes, but is not limited to, benzimidazole, naphthyl, bicyclo[3.1.0]hexane, bicyclo[4.1.0]heptane, spiro[2.4]heptane, spiro[2.5]octane, bicyclo[4.4.0]decane, bicyclo[4.3.0]nonane, bicyclo[3.3.1]nonane, bicyclo[3.2.1]octane, spiro[4.5]decane, spiro[3.5]nonane, norbornane, bicyclo[2.1.0]pentane, bicyclo[3.3.0]octane, bicyclo[2.2.2]octane, bicyclo[3.3.3]undecane, and the like.

The term “tricyclic” means a group having three interconnected saturated, partially-saturated, or fully-unsaturated rings that include stable bridged, fused, or spiro rings. Typically a tricyclic ring system can have from 11 to 18 ring atoms in the ring system. The term includes, but is not limited to, adamantyl, tricyclo[5.2.1.0(2,6)]decane, and the like.

Exemplary bicyclic rings consisting of two fused partially saturated, fully saturated or fully unsaturated five and/or six membered rings, optionally having one to four heteroatoms, are indolizinyl, indolyl, isoindolyl, indolinyl, cyclopenta(b)pyridinyl, pyrano(3,4-b)pyrrolyl, benzofuryl, isobenzofuryl, benzo[b]thienyl, benzo[c]thienyl, 1H-indazolyl, indoxazinyl, benzoxazolyl, anthranilyl, benzimidazolyl, benzthiazolyl, purinyl, quinolinyl, isoquinolinyl, cinnolinyl, phthalazinyl, quinazolinyl, quinoxalinyl, 1,8-naphthyridinyl, pteridinyl, indenyl, isoindenyl, naphthyl, tetralinyl, decalinyl, 2H-1-benzopyranyl, pyrido(3,4-b)pyridinyl, pyrido(3,2-b)pyridinyl, pyrido(4,3-b)-pyridinyl, 2H-1,3-benzoxazinyl, 2H-1,4-benzoxazinyl, 1H-2,3-benzoxazinyl, 4H-3,1-benzoxazinyl, 2H-1,2-benzoxazinyl and 4H-1,4-benzoxazinyl.

A cyclic ring group may be bonded to another group in more than one way. If no particular bonding arrangement is specified, then all possible arrangements are intended. For example, the term “pyridyl” includes 2-, 3-, or 4-pyridyl, and the term “thienyl” includes 2-, or 3-thienyl.

The term “substituted” means that a hydrogen atom on a molecule or group is replaced with a group or atom. Typical substitutents include: halogen, C₁₋₈alkyl, hydroxyl, C₁₋₈alkoxy, —NR^(x)R^(x), nitro, cyano, halo or perhaloC₁₋₈alkyl, C₂₋₈alkenyl, C₂₋₈alkynyl, —SR^(x), —S(═O)₂R^(x), —C(═O)OR^(x), —C(═O)R^(x), wherein each R^(x) is independently hydrogen or C₁-C₈ alkyl. It is noted that when the substituent is —NR^(x)R^(x), the R^(x) groups may be joined together with the nitrogen atom to form a ring.

A group or atom that replaces a hydrogen atom is also called a substituent.

Any particular molecule or group can have one or more substituent depending on the number of hydrogen atoms that can be replaced.

The symbol “—” represents a covalent bond and can also be used in a radical group to indicate the point of attachment to another group. In chemical structures, the symbol is commonly used to represent a methyl group in a molecule.

The term “leaving group” generally refers to groups readily displaceable by a nucleophile, such as an amine, a thiol or an alcohol nucleophile. Such leaving groups are well known in the art. Examples of such leaving groups include, but are not limited to, N-hydroxysuccinimide, N-hydroxybenzotriazole, halides, triflates, tosylates and the like. Preferred leaving groups are indicated herein where appropriate.

The term “protecting group” generally refers to groups well known in the art which are used to prevent selected reactive groups, such as carboxy, amino, hydroxy, mercapto and the like, from undergoing undesired reactions, such as nucleophilic, electrophilic, oxidation, reduction and the like. Preferred protecting groups are indicated herein where appropriate. Examples of amino protecting groups include, but are not limited to, aralkyl, substituted aralkyl, cycloalkenylalkyl and substituted cycloalkenyl alkyl, allyl, substituted allyl, acyl, alkoxycarbonyl, aralkoxycarbonyl, silyl and the like. Examples of aralkyl include, but are not limited to, benzyl, ortho-methylbenzyl, trityl and benzhydryl, which can be optionally substituted with halogen, alkyl, alkoxy, hydroxy, nitro, acylamino, acyl and the like, and salts, such as phosphonium and ammonium salts. Examples of aryl groups include phenyl, naphthyl, indanyl, anthracenyl, 9-(9-phenylfluorenyl), phenanthrenyl, durenyl and the like. Examples of cycloalkenylalkyl or substituted cycloalkylenylalkyl radicals, preferably have 6-10 carbon atoms, include, but are not limited to, cyclohexenyl methyl and the like. Suitable acyl, alkoxycarbonyl and aralkoxycarbonyl groups include benzyloxycarbonyl, t-butoxycarbonyl, iso-butoxycarbonyl, benzoyl, substituted benzoyl, butyryl, acetyl, trifluoroacetyl, trichloro acetyl, phthaloyl and the like. A mixture of protecting groups can be used to protect the same amino group, such as a primary amino group can be protected by both an aralkyl group and an aralkoxycarbonyl group. Amino protecting groups can also form a heterocyclic ring with the nitrogen to which they are attached, for example, 1,2-bis(methylene)benzene, phthalimidyl, succinimidyl, maleimidyl and the like and where these heterocyclic groups can further include adjoining aryl and cycloalkyl rings. In addition, the heterocyclic groups can be mono-, di- or tri-substituted, such as nitrophthalimidyl. Amino groups may also be protected against undesired reactions, such as oxidation, through the formation of an addition salt, such as hydrochloride, toluenesulfonic acid, trifluoroacetic acid and the like. Many of the amino protecting groups are also suitable for protecting carboxy, hydroxy and mercapto groups. For example, aralkyl groups. Alkyl groups are also suitable groups for protecting hydroxy and mercapto groups, such as tert-butyl.

The term “silyl protecting groups” means silicon atoms optionally substituted by one or more alkyl, aryl and aralkyl groups. Suitable silyl protecting groups include, but are not limited to, trimethylsilyl, triethylsilyl, triisopropylsilyl, tert-butyldimethylsilyl, dimethylphenylsilyl, 1,2-bis(dimethylsilyl)benzene, 1,2-bis(dimethylsilyl)ethane and diphenylmethylsilyl. Silylation of an amino groups provide mono- or di-silylamino groups. Silylation of aminoalcohol compounds can lead to a N,N,O-trisilyl derivative. Removal of the silyl function from a silyl ether function is readily accomplished by treatment with, for example, a metal hydroxide or ammonium fluoride reagent, either as a discrete reaction step or in situ during a reaction with the alcohol group. Suitable silylating agents are, for example, trimethylsilyl chloride, tert-butyl-dimethylsilyl chloride, phenyldimethylsilyl chloride, diphenylmethyl silyl chloride or their combination products with imidazole or DMF. Methods for silylation of amines and removal of silyl protecting groups are well known to those skilled in the art. Methods of preparation of these amine derivatives from corresponding amino acids, amino acid amides or amino acid esters are also well known to those skilled in the art of organic chemistry including amino acid/amino acid ester or aminoalcohol chemistry.

Protecting groups are removed under conditions which will not affect the remaining portion of the molecule. These methods are well known in the art and include acid hydrolysis, hydrogenolysis and the like. A preferred method involves removal of a protecting group, such as removal of a benzyloxycarbonyl group by hydrogenolysis utilizing palladium on carbon in a suitable solvent system such as an alcohol, acetic acid, and the like or mixtures thereof. A t-butoxycarbonyl protecting group can be removed utilizing an inorganic or organic acid, such as HCl or trifluoroacetic acid, in a suitable solvent system, such as dioxane or methylene chloride. The resulting amino salt can readily be neutralized to yield the free amine. Carboxy protecting group, such as methyl, ethyl, benzyl, tert-butyl, 4-methoxyphenylmethyl and the like, can be removed under hydrolysis and hydrogenolysis conditions well known to those skilled in the art.

It should be noted that compounds of the invention may contain groups that may exist in tautomeric forms, such as cyclic and acyclic amidine and guanidine groups, heteroatom substituted aromatic heterocyclyl groups (Y′═O, S, NR), and the like, which are illustrated in the following examples:

and though one form is named, described, displayed and/or claimed herein, all the tautomeric forms are intended to be inherently included in such name, description, display and/or claim.

Prodrugs of the compounds of this invention are also contemplated by this invention. A prodrug is an active or inactive compound that is modified chemically through in vivo physiological action, such as hydrolysis, metabolism and the like, into a compound of this invention following administration of the prodrug to a patient. The suitability and techniques involved in making and using prodrugs are well known by those skilled in the art. For a general discussion of prodrugs involving esters see Svensson and Tunek Drug Metabolism Reviews 165 (1988) and Bundgaard Design of Prodrugs, Elsevier (1985). Examples of a masked carboxylate anion include a variety of esters, such as alkyl (for example, methyl, ethyl), cycloalkyl (for example, cyclohexyl), aralkyl (for example, benzyl, p-methoxybenzyl), and alkylcarbonyloxyalkyl (for example, pivaloyloxymethyl). Amines have been masked as arylcarbonyloxymethyl substituted derivatives which are cleaved by esterases in vivo releasing the free drug and formaldehyde (Bungaard J. Med. Chem. 2503 (1989)). Also, drugs containing an acidic NH group, such as imidazole, imide, indole and the like, have been masked with N-acyloxymethyl groups (Bundgaard Design of Prodrugs, Elsevier (1985)). Hydroxy groups have been masked as esters and ethers. EP 039,051 (Sloan and Little, Apr. 11, 1981) discloses Mannich-base hydroxamic acid prodrugs, their preparation and use.

The term “therapeutically effective amount” means an amount of a compound that ameliorates, attenuates or eliminates one or more symptom of a particular disease or condition, or prevents or delays the onset of one of more symptom of a particular disease or condition.

The term “patient” means animals, such as dogs, cats, cows, horses, sheep and humans. Particular patients are mammals. The term patient includes males and females.

The term “pharmaceutically acceptable” means that the referenced substance, such as a compound of Formula I, or a salt of a compound of Formula I, or a formulation containing a compound of Formula I, or a particular excipient, are suitable for administration to a patient.

The terms “treating”, “treat” or “treatment” and the like include preventative (e.g., prophylactic) and palliative treatment.

The term “excipient” means any pharmaceutically acceptable additive, carrier, diluent, adjuvant, or other ingredient, other than the active pharmaceutical ingredient (API), which is typically included for formulation and/or administration to a patient.

Utility and Methods of Use

Provided herein are methods for treating a disorder or disease by inhibiting PDE10 enzyme. The methods, in general, comprises the step of administering a therapeutically effective amount of a compounds of the present invention, or an individual stereoisomer, a mixture of stereoisomers, or a pharmaceutically acceptable salt or solvate thereof, to a patient in need thereof to treat the disorder or disease.

In certain embodiments, this invention provides a use of a compound as described herein in the manufacture of a medicament for treating a disorder or disease treatable by inhibition of PDE10.

The compounds of the present invention inhibit PDE10 enzyme activity, and hence raise the levels of cAMP or cGMP within cells that express PDE10. Accordingly, inhibition of PDE10 enzyme activity would be useful in the treatment of diseases caused by deficient amounts of cAMP or cGMP in cells. PDE10 inhibitors would also be of benefit in cases wherein raising the amount of cAMP or cGMP above normal levels results in a therapeutic effect. Inhibitors of PDE10 may be used to treat disorders of the peripheral and central nervous system, cardiovascular diseases, cancer, gastro-enterological diseases, endocrinological diseases and urological diseases.

Indications that may be treated with PDE10 inhibitors, either alone or in combination with other drugs, include, but are not limited to, those diseases thought to be mediated in part by the basal ganglia, prefrontal cortex, and hippocampus. These indications include psychoses, Parkinson's disease, dementias, obsessive compulsive disorder, tardive dyskinesia, choreas, depression, mood disorders, impulsivity, drug addiction, attention deficit/hyperactivity disorder (ADHD), depression with parkinsonian states, personality changes with caudate or putamen disease, dementia and mania with caudate and pallidal diseases, and compulsions with pallidal disease.

Psychoses are disorders that affect an individual's perception of reality. Psychoses are characterized by delusions and hallucinations. The compounds of the present invention are suitable for use in treating patients suffering from all forms of psychoses, including, but not limited to, schizophrenia, late-onset schizophrenia, schizoaffective disorders, prodromal schizophrenia, and bipolar disorders. Treatment can be for the positive symptoms of schizophrenia as well as for the cognitive deficits and negative symptoms. Other indications for PDE10 inhibitors include psychoses resulting from drug abuse (including amphetamines and PCP), encephalitis, alcoholism, epilepsy, Lupus, sarcoidosis, brain tumors, multiple sclerosis, dementia with Lewy bodies, or hypoglycemia. Other psychiatric disorders, like posttraumatic stress disorder (PTSD), and schizoid personality can also be treated with PDE10 inhibitors.

Obsessive-compulsive disorder (OCD) has been linked to deficits in the frontal-striatal neuronal pathways (Saxena et al., Br. J. Psychiatry Suppl, 35:26-37, 1998). Neurons in these pathways project to striatal neurons that express PDE10. PDE10 inhibitors cause cAMP to be elevated in these neurons; elevations in cAMP result in an increase in CREB phosphorylation and thereby improve the functional state of these neurons. The compounds of the present invention are therefore suitable for use in the indication of OCD. OCD may result, in some cases, from streptococcal infections that cause autoimmune reactions in the basal ganglia (Giedd et al., Am J Psychiatry. 157:281-283, 2000). Because PDE10 inhibitors may serve a neuroprotective role, administration of PDE10 inhibitors may prevent the damage to the basal ganglia after repeated streptococcal infections and thereby prevent the development of OCD.

In the brain, the level of cAMP or cGMP within neurons is believed to be related to the quality of memory, especially long term memory. Without wishing to be bound to any particular mechanism, it is proposed that, since PDE10 degrades cAMP or cGMP, the level of this enzyme affects memory in animals, for example, in humans. A compound that inhibits cAMP phosphodiesterase (PDE) can thereby increase intracellular levels of cAMP, which in turn activate a protein kinase that phosphorylates a transcription factor (cAMP response binding protein). The phosphorylated transcription factor then binds to a DNA promoter sequence to activate genes that are important in long term memory. The more active such genes are, the better is long-term memory. Thus, by inhibiting a phosphodiesterase, long term memory can be enhanced.

Dementias are diseases that include memory loss and additional intellectual impairment separate from memory. The compounds of the present invention are suitable for use in treating patients suffering from memory impairment in all forms of dementia. Dementias are classified according to their cause and include: neurodegenerative dementias (e.g., Alzheimer's, Parkinson's disease, Huntington's disease, Pick's disease), vascular (e.g., infarcts, hemorrhage, cardiac disorders), mixed vascular and Alzheimer's, bacterial meningitis, Creutzfeld-Jacob Disease, multiple sclerosis, traumatic (e.g., subdural hematoma or traumatic brain injury), infectious (e.g., HIV), genetic (down syndrome), toxic (e.g., heavy metals, alcohol, some medications), metabolic (e.g., vitamin B12 or folate deficiency), CNS hypoxia, Cushing's disease, psychiatric (e.g., depression and schizophrenia), and hydrocephalus.

The condition of memory impairment is manifested by impairment of the ability to learn new information and/or the inability to recall previously learned information. The present invention includes methods for dealing with memory loss separate from dementia, including mild cognitive impairment (MCI) and age-related cognitive decline. The present invention includes methods of treatment for memory impairment as a result of disease. Memory impairment is a primary symptom of dementia and can also be a symptom associated with such diseases as Alzheimer's disease, schizophrenia, Parkinson's disease, Huntington's disease, Pick's disease, Creutzfeld-Jakob disease, HIV, cardiovascular disease, and head trauma as well as age-related cognitive decline. The compounds of the present invention are suitable for use in the treatment of memory impairment due to, for example, Alzheimer's disease, multiple sclerosis, amylolaterosclerosis (ALS), multiple systems atrophy (MSA), schizophrenia, Parkinson's disease, Huntington's disease, Pick's disease, Creutzfeld-Jakob disease, depression, aging, head trauma, stroke, spinal cord injury, CNS hypoxia, cerebral senility, diabetes associated cognitive impairment, memory deficits from early exposure of anesthetic agents, multiinfarct dementia and other neurological conditions including acute neuronal diseases, as well as HIV and cardiovascular diseases.

The compounds of the present invention are also suitable for use in the treatment of a class of disorders known as polyglutamine-repeat diseases. These diseases share a common pathogenic mutation. The expansion of a CAG repeat, which encodes the amino acid glutamine, within the genome leads to production of a mutant protein having an expanded polyglutamine region. For example, Huntington's disease has been linked to a mutation of the protein huntingtin. In individuals who do not have Huntington's disease, huntingtin has a polyglutamine region containing about 8 to 31 glutamine residues. For individuals who have Huntington's disease, huntingtin has a polyglutamine region with over 37 glutamine residues. Aside from Huntington's disease (HD), other known polyglutamine-repeat diseases and the associated proteins include dentatorubral-pallidoluysian atrophy, DRPLA (atrophin-1); spinocerebellar ataxia type-1 (ataxin-1); spinocerebellar ataxia type-2 (ataxin-2); spinocerebellar ataxia type-3 (also called Machado-Joseph disease or MJD) (ataxin-3); spinocerebellar ataxia type-6 (alpha 1a-voltage dependent calcium channel); spinocerebellar ataxia type-7 (ataxin-7); and spinal and bulbar muscular atrophy (SBMA, also know as Kennedy disease).

The basal ganglia are important for regulating the function of motor neurons; disorders of the basal ganglia result in movement disorders. Most prominent among the movement disorders related to basal ganglia function is Parkinson's disease (Obeso et al., Neurology. 62(1 Suppl 1):S17-30, 2004). Other movement disorders related to dysfunction of the basal ganglia include tardive dyskinesia, progressive supranuclear palsy and cerebral palsy, corticobasal degeneration, multiple system atrophy, Wilson disease, dystonia, tics, and chorea. The compounds of the invention are also suitable for use to treat movement disorders related to dysfunction of basal ganglia neurons.

PDE10 inhibitors are useful in raising cAMP or cGMP levels and prevent neurons from undergoing apoptosis. PDE10 inhibitors may be anti-inflammatory by raising cAMP in glial cells. The combination of anti-apoptotic and anti-inflammatory properties, as well as positive effects on synaptic plasticity and neurogenesis, make these compounds useful to treat neurodegeneration resulting from any disease or injury, including stroke, spinal cord injury, Alzheimer's disease, multiple sclerosis, amylolaterosclerosis (ALS), and multiple systems atrophy (MSA).

Autoimmune diseases or infectious diseases that affect the basal ganglia may result in disorders of the basal ganglia including ADHD, OCD, tics, Tourette's disease, Sydenham chorea. In addition, any insult to the brain can potentially damage the basal ganglia including strokes, metabolic abnormalities, liver disease, multiple sclerosis, infections, tumors, drug overdoses or side effects, and head trauma. Accordingly, the compounds of the invention can be used to stop disease progression or restore damaged circuits in the brain by a combination of effects including increased synaptic plasticity, neurogenesis, anti-inflammatory, nerve cell regeneration and decreased apoptosis.

The growth of some cancer cells is inhibited by cAMP and cGMP. Upon transformation, cells may become cancerous by expressing PDE10 and reducing the amount of cAMP or cGMP within cells. In these types of cancer cells, inhibition of PDE10 activity inhibits cell growth by raising cAMP. In some cases, PDE10 may be expressed in the transformed, cancerous cell but not in the parent cell line. In transformed renal carcinoma cells, PDE10 is expressed and PDE10 inhibitors reduce the growth rate of the cells in culture. Similarly, breast cancer cells are inhibited by administration of PDE10 inhibitors. Many other types of cancer cells may also be sensitive to growth arrest by inhibition of PDE10. Therefore, compounds disclosed in this invention can be used to stop the growth of cancer cells that express PDE10.

The compounds of the invention are also suitable for use in the treatment of diabetes and related disorders such as obesity, by focusing on regulation of the cAMP signaling system. By inhibiting PDE-10, especially PDE-10A, intracellular levels of cAMP are increased, thereby increasing the release of insulin-containing secretory granules and, therefore, increasing insulin secretion. See, for example, WO 2005/012485. The compounds of Formula (I) can also be used to treat diseases disclosed in US Patent application publication No. 2006/019975.

Testing

The PDE10 inhibitory activities of the compounds of the present invention can be tested, for example, using the in vitro and in vivo assays described in the Biological Examples below.

Administration and Pharmaceutical Compositions

In general, the compounds of this invention can be administered in a therapeutically effective amount by any of the accepted modes of administration for agents that serve similar utilities. The actual amount of a compound of this invention, i.e., the active ingredient, depends upon numerous factors, such as the severity of the disease to be treated, the age and relative health of the subject, the potency of the compound used, the route and form of administration, and other factors.

Therapeutically effective amounts of compounds of formula (I) may range from approximately 0.1-1000 mg per day; preferably 0.5 to 250 mg/day, more preferably 3.5 mg to 70 mg per day.

In general, compounds of this invention can be administered as pharmaceutical compositions by any one of the following routes: oral, systemic (e.g., transdermal, intranasal or by suppository), or parenteral (e.g., intramuscular, intravenous or subcutaneous) administration. The preferred manner of administration is oral using a convenient daily dosage regimen, which can be adjusted according to the degree of affliction. Compositions can take the form of tablets, pills, capsules, semisolids, powders, sustained release formulations, solutions, suspensions, elixirs, aerosols, or any other appropriate compositions.

The choice of formulation depends on various factors, such as the mode of drug administration (e.g., for oral administration, formulations in the form of tablets, pills or capsules are preferred) and the bioavailability of the drug substance. Recently, pharmaceutical formulations have been developed especially for drugs that show poor bioavailability based upon the principle that bioavailability can be increased by increasing the surface area, i.e., decreasing particle size. For example, U.S. Pat. No. 4,107,288 describes a pharmaceutical formulation having particles in the size range from 10 to 1,000 nm in which the active material is supported on a crosslinked matrix of macromolecules. U.S. Pat. No. 5,145,684 describes the production of a pharmaceutical formulation in which the drug substance is pulverized to nanoparticles (average particle size of 400 nm) in the presence of a surface modifier and then dispersed in a liquid medium to give a pharmaceutical formulation that exhibits remarkably high bioavailability.

The compositions are comprised of, in general, a compounds of the present invention in combination with at least one pharmaceutically acceptable excipient. Acceptable excipients are non-toxic, aid administration, and do not adversely affect the therapeutic benefit of the compounds of the present invention. Such excipient may be any solid, liquid, semi-solid or, in the case of an aerosol composition, gaseous excipient that is generally available to one of skill in the art.

Solid pharmaceutical excipients include starch, cellulose, talc, glucose, lactose, sucrose, gelatin, malt, rice, flour, chalk, silica gel, magnesium stearate, sodium stearate, glycerol monostearate, sodium chloride, dried skim milk and the like. Liquid and semisolid excipients may be selected from glycerol, propylene glycol, water, ethanol and various oils, including those of petroleum, animal, vegetable or synthetic origin, e.g., peanut oil, soybean oil, mineral oil, sesame oil, etc. Preferred liquid carriers, particularly for injectable solutions, include water, saline, aqueous dextrose, and glycols.

Compressed gases may be used to disperse a compound of this invention in aerosol form. Inert gases suitable for this purpose are nitrogen, carbon dioxide, etc.

Other suitable pharmaceutical excipients and their formulations are described in Remington's Pharmaceutical Sciences, Gennaro, A. R. (Mack Publishing Company, 18th ed., 1995).

The level of the compound in a formulation can vary within the full range employed by those skilled in the art. Typically, the formulation contains, on a weight percent (wt %) basis, from about 0.01-99.99 wt % of a compounds of the present invention based on the total formulation, with the balance being one or more suitable pharmaceutical excipients. Preferably, the compound is present at a level of about 1-80 wt %.

The compounds can be administered as the sole active agent or in combination with other pharmaceutical agents such as other agents used in the treatment of psychoses, especially schizophrenia and bipolar disorder, obsessive-compulsive disorder, Parkinson's disease, Alzheimer's disease, cognitive impairment and/or memory loss, e.g., nicotinic α-7 agonists, PDE4 inhibitors, other PDE10 inhibitors, calcium channel blockers, muscarinic m1 and m2 modulators, adenosine receptor modulators, ampakines, NMDA-R modulators, mGluR modulators, dopamine modulators, serotonin modulators, canabinoid modulators, and cholinesterase inhibitors (e.g., donepezil, rivastigimine, and galanthanamine). In such combinations, each active ingredient can be administered either in accordance with their usual dosage range or a dose below their usual dosage range, and can be administered either simultaneously or sequentially.

Drugs suitable in combination with the compounds of the present invention include, but are not limited to, other suitable schizophrenia drugs such as Clozaril, Zyprexa, Risperidone, and Seroquel; bipolar disorder drugs, including, but not limited to, Lithium, Zyprexa, and Depakote; Parkinson's disease drugs, including, but not limited to, Levodopa, Parlodel, Permax, Mirapex, Tasmar, Contan, Kemadin, Artane, and Cogentin; agents used in the treatment of Alzheimer's disease, including, but not limited to, Reminyl, Cognex, Aricept, Exelon, Akatinol, Neotropin, Eldepryl, Estrogen and Cliquinol; agents used in the treatment of dementia, including, but not limited to, Thioridazine, Haloperidol, Risperidone, Cognex, Aricept, and Exelon; agents used in the treatment of epilepsy, including, but not limited to, Dilantin, Luminol, Tegretol, Depakote, Depakene, Zarontin, Neurontin, Barbita, Solfeton, and Felbatol; agents used in the treatment of multiple sclerosis, including, but not limited to, Detrol, Ditropan XL, OxyContin, Betaseron, Avonex, Azothioprine, Methotrexate, and Copaxone; agents used in the treatment of Huntington's disease, including, but not limited to, Amitriptyline, Imipramine, Despiramine, Nortriptyline, Paroxetine, Fluoxetine, Setraline, Terabenazine, Haloperidol, Chloropromazine, Thioridazine, Sulpride, Quetiapine, Clozapine, and Risperidone; agents useful in the treatment of diabetes, including, but not limited to, PPAR ligands (e.g. agonists, antagonists, such as Rosiglitazone, Troglitazone and Pioglitazone), insulin secretagogues (e.g., sulfonylurea drugs, such as Glyburide, Glimepiride, Chlorpropamide, Tolbutamide, and Glipizide, and non-sulfonyl secretagogues), α-glucosidase inhibitors (such as Acarbose, Miglitol, and Voglibose), insulin sensitizers (such as the PPAR-γ agonists, e.g., the glitazones; biguanides, PTP-1B inhibitors, DPP-IV inhibitors, and 11beta-HSD inhibitors), hepatic glucose output lowering compounds (such as glucagon antagonists and metaformin, e.g., Glucophage and Glucophage XR), insulin and insulin derivatives (both long and short acting forms and formulations of insulin); and anti-obesity drugs, including, but not limited to, β-3 agonists, CB-1 agonists, neuropeptide Y5 inhibitors, Ciliary Neurotrophic Factor and derivatives (e.g., Axokine), appetite suppressants (e.g., Sibutramine), and lipase inhibitors (e.g., Orlistat).

EXPERIMENTAL

Unless otherwise noted, all materials were purchased from Sinopharm Chemical Reagent Co., Ltd and used without further purification. All microwave assisted reactions were conducted with a Initiator Synthesizer® from Biotage®. All compounds showed NMR spectra consistent with their assigned structures. Melting points were determined on a Buchi apparatus and are uncorrected. Mass spectral data was determined by electrospray ionization technique. All examples were purified to >90% purity as determined by high-performance liquid chromatography. Unless otherwise stated, reactions were run at room temperature.

The following abbreviations are commonly used:

-   Ac the group CH₃—(CO)— -   AcOH or HOAc acetic acid -   Ac₂O acetic anhydride -   BINAP 2,2′-bis(diphenylphosphino)-1,1′-binaphthalene -   BnO Benzyloxy -   Boc₂O di-tert-butyl dicarbonate -   BTEA-Cl benzyltriethylammonium chloride -   Bz Benzyl group -   Cbz carboxylic acid benzyl ester -   CDI 1,1′-carbonyldiimidazole -   d Day -   DCM Dichloromethane -   DIAD (CH₃)₂CHOOCN═NCOOCH(CH₃)₂ -   DIEA N,N-diisopropylethylamine -   Diox Dioxane -   DIPEA diisopropylethyl amine -   DMA Dimethylamine -   DMAP 4-(dimethylamino)pyridine -   DME Dimethoxyethane -   DMF N,N-dimethylformamide -   Dess-Martin Periodinane     1,1,1-Tris(acetyloxy)-1,1-dihydro-1,2-benziodoxol-3-(1H)-one -   DMSO dimethyl sulfoxide -   DPPA diphenyl phosphoryl azide -   EDCI N-(3-Dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride -   ESI-MS electrospray ionization mass spectrometry -   Et₂O diethyl ether -   EtOAc ethyl acetate -   EtOH ethyl alcohol -   Et₃N triethyl amine -   g Grams -   h hour or hours -   HATU O-(7-Azobenzotriazol-1-yl)-1,1,3,3-tetramethyluronium     hexafluorophosphate -   HBTU 2-(1H-Benzotriazole-1-yl)-1,1,3,3-tetramethylaminium     hexafluorophosphate -   HCl Hydrochloric acid -   HPLC high pressure liquid chromatography -   IPA isopropyl alcohol -   iPr₂NEt diisopropylethylamine -   iPrOH Isopropyl alcohol -   ISCO in-situ chemical oxidation -   Lawesson reagent 4-Methoxyphenylthiophosphoric cyclic     di(thioanhydride), LR,     2,4-Bis(4-methoxyphenyl)-2,4-dithioxo-1,3,2,4-dithiadiphosphetane,     2,4-Bis-(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane 2,4-disulfide -   LCMS liquid chromatography mass spectrometry -   LDA Lithium diisopropyl amide -   LiHMDS Lithium bis(trimethylsilyl)amide -   Me Methyl -   MeCN Acetonitrile -   MeI Iodomethane -   MeOH methyl alcohol -   MeOD deuteurated methyl alcohol -   mg Milligrams -   min Min -   mL Milliliters -   Mo—(CO)₆ molybdenum hexacarbonyl -   MTBE methyl tert-butyl ether -   NBS N-bromosuccinimide -   NMP 1-methyl-2-pyrrolidinone -   NMR nuclear magnetic resonance -   NOESY nuclear Overhauser effect spectroscopy -   Pd(dppf)Cl_(2 [)1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II),     complex with dichloromethane -   PMBCl 1-(chloromethyl)-4-methoxybenzene -   PTSA p-toluenesulfonic acid -   Py pyridine -   RT RT -   sat. saturated -   t-bu tert-butyl group -   TFA trifluoroacetic acid -   THF tetrahydrofuran -   TLC thin layer chromatography -   TMSCl Trimethylsilyl chloride -   TBDPS Tert-Butylchlorodiphenyl -   Tol Toluene -   TsCl 4-toluenesulfonyl chloride (CH₃C₆H₄SO₂Cl) -   Xantphos 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene

GENERAL SCHEMES

In general, the compounds of the formula I can be prepared according to the following General Schemes A to H, wherein m, p, q, R¹, R^(4a), R^(4b), R⁵, Y, X¹, X², X³, X⁴, and X⁵ are defined herein.

Preparation 1

Zinc Dust Preactivation Procedure

Zinc dust (Acros) was slowly added to a well stirred solution of aqueous 2N HCl. The material was allowed to stir for 30 min at which point it was filtered, washed with water, EtOH, and diethyl ether. The material was dried using a rotavapor.

Step 1: tert-butyl 3-(3-bromopyridin-2-yl)azetidine-1-carboxylate (3)

A 5 L 3-neck round bottom flask fitted with a magnetic stirrer under nitrogen was charged with zinc dust (138 g, preactivated according to the above Preparation 1, 2.11 mol, 2 eq.) and DMA (370 mL, anhydrous). 1,2-dibromoethane (13 mL, 0.158 mol, 0.15 eq, Aldrich) was then added over 5 min, followed by TMSCl (20 mL, 0.158 mol, 0.15 eq, Acros) over 5 min. The reaction mixture was stirred for 20 min at RT. A solution of N-Boc-3-iodoazetidine (2) (448 g, 1.583 mol, 1.5 eq, CNH Technologies) in DMA (925 mL, anhydrous) was added over 25 min keeping the internal temperature below 65° C. using a water bath. The suspension was stirred for 1 h at RT at which point it was degassed with nitrogen. Stirring was stopped and the suspension was allowed to stand. A 12 L 3-neck round bottom flask fitted with a mechanical stirrer was charged with 2,3-dibromopyridine (1) (250 g, 1.055 mol, 1.0 eq, Frontier Scientific), PdCl₂dppf.CH₂Cl₂ (25.8 g, 31.65 mmol, 0.03 eq, Aldrich), CuI (12.5 g, 65.41 mmol, 0.062 eq, Aldrich), and DMA (925 mL, anhydrous). The solution was degassed with nitrogen. The clear zinc reagent solution above the residual solid zinc was poured into the 12 L flask under nitrogen. The brown solution was degassed with nitrogen and heated to 80° C. for 17 h at which point LCMS indicated complete conversion of 2,3-dibromopyridine (1). The reaction mixture was transferred to brine (2 L) in 22 L separatory funnel. Water (2 L) and EtOAc (4 L) were added and the layers were separated. The aqueous layer was extracted with EtOAc (2×3 L). The combined organics were washed with water (3×3 L) and brine (2 L), dried over sodium sulfate and evaporated. The resulting residue was purified by column chromatography (eluting with hexanes/ethyl acetate=9:1 to 5:1) to obtain 289 g of impure tert-butyl 3-(3-bromopyridin-2-yl)azetidine-1-carboxylate (3) which was distilled under high vacuum to remove the impurity (N-Boc-azetidine) to give 281 g of pure tert-butyl 3-(3-bromopyridin-2-yl)azetidine-1-carboxylate. Yield: 85%.

Step 2: 2-(azetidin-3-yl)-3-bromopyridine hydrochloride (4)

To a solution of tert-butyl 3-(3-bromopyridin-2-yl)azetidine-1-carboxylate (3) (266 g, 0.849 mol, 1 eq.) in methanol (6 L) was added concentrated HCl (350 mL, 4.2 mol, 4.95 eq.) and the resulting mixture was stirred at RT for 92 hrs. The mixture was concentrated and dried using a rotavapor to obtain 230 g of 2-(azetidin-3-yl)-3-bromopyridine hydrochloride (4).

Step 3: 2-(3-(3-bromopyridin-2-yl)azetidin-1-yl)quinoline (5)

A mixture of 2-(azetidin-3-yl)-3-bromopyridine hydrochloride (4) (221 g, 0.886 mol), 2-chloroquinoline (133.5 g, 0.816 mol, 0.92 eq., Combi-Blocks) and cesium carbonate (866 g, 2.658 mol, 3 eq.) in anhydrous DMF (7 L) was heated to 110° C. and stirred for 16 hrs. After cooling to RT, the mixture was transferred to 50 L separatory funnel and diluted with water (14 L). The precipitated solid was filtered, stirred in water (4 L), filtered and dried to obtain 222 g of 2-(3-(3-bromopyridin-2-yl)azetidin-1-yl)quinoline. Yield: 80% over two steps.

¹H NMR (300 MHz, d₆-DMSO) δ ppm 8.58 (d, J=4.8 Hz, 1H), 8.11 (d, J=8.1 Hz, 1H), 8.04 (d, J=9.0 Hz, 1H), 7.71 (d, J=8.1 Hz, 1H), 7.65-7.50 (m, 2H), 7.35-7.15 (m, 2H), 6.81 (d, J=9.0 Hz, 1H), 4.55-4.30 (m, 5H). HPLC purity: >98% (215 nm and 254 nm)

LCMS: m/z: 340.1 for ⁷⁹Br (M+1), Calcd. for C₁₇H₁₄ ⁷⁹BrN₃: 339.04; 342.1 for ⁸¹Br (M+1), Calcd. for C₁₇H₁₄ ⁸¹BrN₃: 341.04.

Preparation 2

Step 1: tert-butyl 3-(3-chloropyrazin-2-yl)azetidine-1-carboxylate (7)

A 12 L 3-neck round bottom flask fitted with a magnetic stirrer under nitrogen was charged with zinc dust (745 g, preactivated according to the above Preparation 1, 11.4 mol, 2 eq.) and DMA (2 L, anhydrous). 1,2-dibromoethane (71 mL, 0.855 mol, 0.15 eq, Aldrich) was then added over 10 min, followed by TMSCl (108 mL, 0.855 mol, 0.15 eq, Acros) over 20 min. The reaction mixture was stirred for 25 min at RT. A solution of N-Boc-3-iodoazetidine (2) (2420 g, 8.55 mol, 1.5 eq, CNH Technologies) in DMA (5 L, anhydrous) was added via a 2 L addition funnel over 2 h keeping the internal temperature below 65° C. using a water bath. The suspension was stirred for 1 h at RT at which point it was degassed with nitrogen. Stirring was stopped and the suspension was allowed to stand. A 22 L 3-neck round bottom flask fitted with a mechanical stirrer was charged with 2,3-dichloropyrazine (6) (850 g, 5.70 mol, 1.0 eq, AK Scientific), PdCl₂dppf.CH₂Cl₂ (140 g, 171 mmol, 0.03 eq, Aldrich), CuI (67.3 g, 353 mmol, 0.062 eq, Aldrich), and DMA (5 L, anhydrous). The solution was degassed with nitrogen. The clear zinc reagent solution above the residual solid zinc was poured into the 22 L flask under nitrogen. The brown solution was degassed with nitrogen and heated to 80° C. for 16 h at which point LCMS indicated complete conversion of 2,3-dichloropyrazine (6). The reaction mixture was transferred to brine (8 L) in 50 L reparatory funnel. Water (8 L) and EtOAc (15 L) were added and the layers were separated. The aqueous layer was extracted with EtOAc (2×10 L). The combined organics were washed with water (3×10 L) and brine (5 L), dried over sodium sulfate and evaporated. The resulting residue was purified by column chromatography (eluting with hexanes/ethyl acetate=10:1) to obtain 536 g of pure tert-butyl 3-(3-chloropyrazin-2-yl)azetidine-1-carboxylate (7) and 121 g of mixed fractions. The impure material was distilled under high vacuum to remove the impurity (N-Boc-azetidine) to give 81 g of pure tert-butyl 3-(3-chloropyrazin-2-yl)azetidine-1-carboxylate (7).

Total: 617 g, Yield: 40%.

Step 2: 2-(azetidin-3-yl)-3-chloropyrazine hydrochloride (8)

To a solution of tert-butyl 3-(3-chloropyrazin-2-yl)azetidine-1-carboxylate (7) (300 g, 1.112 mol, 1 eq.) in methanol (6 L) was added concentrated HCl (400 mL, 4.8 mol, 4.3 eq.) and the resulting mixture was stirred at RT for 112 h. The mixture was concentrated and dried on rotavapor to obtain 230 g of 2-(azetidin-3-yl)-3-chloropyrazine hydrochloride (8).

Step 3: 2-(3-(3-chloropyrazin-2-yl)azetidin-1-yl)quinoline (9)

A mixture of 2-(azetidin-3-yl)-3-chloropyrazine hydrochloride (8) (163 g, 0.79 mol), 2-bromoquinoline (164 g, 0.79 mol, 1 eq., Combi-Blocks) and cesium carbonate (772 g, 2.37 mol, 3 eq., Aldrich) in anhydrous DMF (6.5 L) was heated to 110° C. and stirred for 19 h. After cooling to RT, the mixture was transferred to 50 L separatory funnel and diluted with water (13 L). Then it was extracted with ethyl acetate (20 L×2) and the organic extracts were combined, washed with water (8 L), brine (8 L), dried and concentrated. The resulting residue was purified by column chromatography (eluting with hexanes/ethyl acetate=9:1 to 3:1). All fractions containing desired compound were combined and concentrated. The obtained solid was triturated with MTBE (250 mL), washed with MTBE (100 mL×2) and dried to obtain 100 g of 2-(3-(3-chloropyrazin-2-yl)azetidin-1-yl)quinoline (9) with >99% purity. The mother liquor was concentrated and purified by column chromatography and trituration with MTBE again to give 4.5 g of 2-(3-(3-chloropyrazin-2-yl)azetidin-1-yl)quinoline (9) with >99% purity. Yield: 45% for two steps.

¹H NMR (300 MHz, d₆-DMSO) δ ppm 8.67 (d, J=2.4 Hz, 1H), 8.44 (d, J=2.4 Hz, 1H), 8.04 (d, J=9.6 Hz, 1H), 7.72 (d, J=8.4 Hz, 1H), 7.65-7.50 (m, 2H), 7.23 (t, J=7.35 Hz, 2H), 6.79 (d, J=9.0 Hz, 1H), 4.60-4.30 (m, 5H). HPLC purity: >99% (215 nm and 254 nm) LCMS: m/z: 297.1 (M+1), Calcd. for C₁₆H₁₃ClN₄: 296.08.

Preparation 3

2-(3-(3-chloropyrazin-2-yl)azetidin-1-yl)quinazoline (10)

2-(Azetidin-3-yl)-3-chloropyrazine hydrochloride (8) (1.50 g, 7.28 mmol), 2-chloroquinazoline (1.20 g, 7.28 mmol, Parkway Scientific), and cesium carbonate (5.22 g, 16.0 mmol, Fluka) were mixed in DMF (30 mL) in a round bottom flask under a nitrogen atmosphere. The mixture was stirred at 110° C. for 17 h. The reaction mixture was cooled to RT, diluted with water, and extracted with EtOAc (2×). The combined organic extracts were washed with saturated sodium chloride, dried over magnesium sulfate, filtered, and concentrated in vacuo. The resulting crude mixture was purified via silica gel flash column chromatography eluting with 0% to 100% EtOAc in hexanes to give 1.02 g (47%) of a yellow amorphous solid.

¹H NMR (400 MHz, CHLOROFORM-d) δ ppm 4.41-4.50 (m, 1H) 4.58-4.63 (m, 2H) 4.65-4.72 (m, 2H) 7.22-7.28 (m, 1H) 7.61-7.72 (m, 3H) 8.28 (d, J=2.35 Hz, 1H) 8.51 (d, J=2.35 Hz, 1H) 9.04 (s, 1H). ESI (M+1) 298.1; calc for C₁₅H₁₂ClN₅ 297.

Preparation 4

Step 1. 3-(3-morpholin-4-yl-pyrazin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (11)

A mixture of 3-(3-chloro-pyrazin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (7) (269 mg, 1.0 mmol) in morpholine was heated by microwave at 160° C. for 2 h. The mixture was concentrated to give the crude compound and which was purified by column chromatography to afford pure product (11) (300 mg, yield 94%) as solid. ESI-MS (M+1): 321 calc. for C₁₆H₂₄N₄O₃ 320.

Step 2. 4-(3-azetidin-3-yl-pyrazin-2-yl)-morpholine hydrochloride (12)

To a solution of 4 N HCl/MeOH (10 mL) was added compound (II) (300 mg, 0.90 mmol) at 0° C. and the resulting mixture was stirred at RT for 1 h. The mixture was concentrated under reduced pressure to give (12) (200 mg, yield 100%), which was used directly for the next step without further purification. ESI-MS (M+1): 221 calc. for C₁₁H₁₆N₄O 220.

The following Table 1 lists compounds of Preparation P4.1 to P4.4, which were made analogous to Preparation 4 by using the appropriate materials.

TABLE 1 PREPARATION P4.1 TO P4.4 ESI-MS Prep. # Structure Chemical Name (M + 1) P4.1

tert-butyl 3-(3-morpholinopyrazin-2- yl)azetidin-1-carboxylate 321 P4.2

tert-butyl 3-(3-(4-hydroxypiperidin-1- yl)pyrazin-2-yl)azetidine-1- carboxylate 335 P4.3

4-(3-azetidin-3-yl-pyrazin-2-yl)- morpholine hydrochloride 221 P4.4

1-(3-(azetidin-3-yl)pyrazin-2- yl)piperidin-4-ol hydrochloride 235

Preparation 5

Step 1. 3-[3-(2-methoxy-phenoxy)-pyrazin-2-yl]-azetidine-1-carboxylic acid tert-butyl ester (13)

A mixture of 3-(3-chloro-pyrazin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (7) (100 mg, 0.37 mmol), 2-methoxy-phenol (47 mg, 0.37 mmol) and Cs₂CO₃ (242 mg, 0.74 mmol) in DMSO (10 mL) was stirred at 90° C. overnight. The mixture was diluted with water and extracted with EtOAc. The organic layer was washed with brine, dried over Na₂SO₄ and concentrated to give the crude compound, which was purified by column chromatography to afford pure product (13) (80 mg, 0.22 mmol, yield 61%) as solid. ESI-MS (M+1): 358 calc. for C₁₉H₂₃N₃O₄ 357.

Step 2. 2-azetidin-3-yl-3-(2-methoxy-phenoxy)-pyrazine hydrochloride (14)

To a solution of 4 N HCl/MeOH (10 mL) was added compound (13) (80 mg, 0.22 mmol) at 0° C. The resulting mixture was stirred at RT for 1 h. The mixture was concentrated under reduced pressure to give (14) (65 mg, yield 100%), which was used for the next step without further purification. ESI-MS (M+1): 258 calc. for C₁₄H₁₅N₃O₂ 257.

The following Table 2 lists compounds of Preparation P5.1 to P5.8, which were made analogous to Preparation 5 by using the appropriate materials.

TABLE 2 PREPARATION P5.1 TO P5.8 ESI-MS Ex. # Structure Chemical Name (M + 1) P5.1

3-[3-(2-methoxy-phenoxy)-pyrazin- 2-yl]-azetidine-1-carboxylic acid tert-butyl ester 358 P5.2

tert-butyl 3-(3-(3- methoxyphenoxy)pyrazin-2- yl)azetidin-1-carboxylate 358 P5.3

tert-butyl 3-(3-(4- methoxyphenoxy)pyrazin-2- yl)azetidine-1-carboxylate 358 P5.4

tert-butyl 3-(3-phenoxypyrazin-2- yl)azetidine-1-carboxylate 328 P5.5

2-azetidin-3-yl-3-(2-methoxy- phenoxy)-pyrazine hydrochloride 258 P5.6

2-(azetidin-3-yl)-3-(3- methoxyphenoxy)pyrazine hydrochloride 258 P5.7

2-(azetidin-3-yl)-3-(4- methoxyphenoxy)pyrazine hydrochloride 258 P5.8

2-(azetidin-3-yl)-3- phenoxypyrazine hydrochloride 228

Preparation 6

Step 1. 2-trichloromethyl-1H-benzoimidazole (17)

2,2,2-trichloro-acetimidic acid benzyl ester (16) (2.3 g, 9.22 mmol, Alfa Aesar) was added to a solution of Benzene-1,2-diamine (15) (1.0 g, 9.2 mmol) in acetic acid (30 mL), the solution was stirred at RT for 1 h. H₂O (20 mL) was added to the mixture and the suspension was filtered. The filter cake was washed with water and dried under vacuum to afford compound (17) (1.90 g yield 88%) which was used directly for the next step without further purification. ESI-MS (M+1): 235 calc. for C₈H₅Cl₃N₂ 234.

Step 2. 1H-benzoimidazole-2-carboxylic acid methyl ester (18)

Na₂CO₃ (0.64 g, 6.07 mmol) was added to a solution of (17) (1.9 g, 6.07 mmol) in 20 mL MeOH. The reaction mixture was heated to reflux for 14 h and then cooled to RT. 1N HCl was added to the solution and the reaction mixture was stirred for 0.5 hour. The mixture was extracted with EA. The organic phase was washed with brine, dried over Na₂SO₄ and evaporated to give the title compound (0.89 g, yield 83%). ESI-MS (M+1): 177 calc. for C₉H₈N₂O₂ 176.

Step 3. 1H-benzoimidazole-2-carboxylic acid (19)

A mixture of 1H-benzoimidazole-2-carboxylic acid methyl ester (18) (0.89 g, 5.1 mmol) in 2 N aq. NaOH (10 mL) and MeOH (10 mL) was stirred at RT for 18 h. The mixture was acidified to pH=4 with 1 N aqueous HCl. The mixture was extracted with EtOAc. The organic layer was washed with brine, dried over Na₂SO₄ and evaporated to obtain compound (19) as a brown solid (0.67 g, yield 80%). ESI-MS (M+1): 163 calc. for C₈H₆N₂O₂ 162.

The following Table 3 lists compounds of Preparation P6.1 to P6.18, which were made analogous to Preparation 6 by using the appropriate materials.

TABLE 3 PREPARATION P6.1 TO P6.18 ESI-MS Ex. # Structure Chemical Name (M + 1) P6.1 

4-chloro-2-(trichloromethyl)-1H- benzo[d]imidazole 268 P6.2 

5-chloro-2-(trichloromethyl)-1H- benzo[d]imidazole 268 P6.3 

4-fluoro-2-(trichloromethyl)-1H- benzo[d]imidazole 252 P6.4 

5-fluoro-2-(trichloromethyl)-1H- benzo[d]imidazole 252 P6.5 

4-methyl-2-(trichloromethyl)-1H- benzo[d]imidazol 249 P6.6 

5-methyl-2-(trichloromethyl)-1H- benzo[d]imidazole 249 P6.7 

methyl 4-chloro-1H- benzo[d]imidazole-2-carboxylate 211 P6.8 

methyl 5-chloro-1H- benzo[d]imidazole-2-carboxylate 211 P6.9 

methyl 4-fluoro-1H- benzo[d]imidazole-2-carboxylate 195 P6.10

methyl 5-fluoro-1H- benzo[d]imidazole-2-carboxylate 195 P6.11

methyl 4-methyl-1H- benzo[d]imidazole-2-carboxylate 191 P6.12

methyl 5-methyl-1H- benzo[d]imidazole-2-carboxylate 191 P6.13

4-chloro-1H-benzo[d]imidazole-2- carboxylic acid 197 P6.14

5-chloro-1H-benzo[d]imidazole-2- carboxylic acid 197 P6.15

4-fluoro-1H-benzo[d]imidazole-2- carboxylic acid 181 P6.16

5-fluoro-1H-benzo[d]imidazole-2- carboxylic acid 181 P6.17

4-methyl-1H-benzo[d]imidazole-2- carboxylic acid 177 P6.18

5-methyl-1H-benzo[d]imidazole-2- carboxylic acid 177

Preparation 7

Step 1. 3-[3-(4-methoxy-phenyl)-pyrazin-2-yl]-azetidine-1-carboxylic acid tert-butyl ester (21)

To a solution of 3-(3-chloro-pyrazin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (7) (100 mg, 0.37 mmol, as prepared in the above Preparation 2) in dioxane (8 mL) was added a solution of Na₂CO₃ (78 mg, 0.64 mmol) in 0.5 mL water, followed by additional of 4-methoxybenzeneboronic acid (20) (49 mg 0.40 mmol) and Pd(dppf)Cl₂ (8 mg). The resulting mixture was heated to reflux overnight under N₂ atmosphere. TLC showed that the starting material was consumed completely. The solution was filtered and the filtrate was concentrated to give the residue which was purified by column chromatography on silica gel to give the product compound (21) (120 mg, yield 96%) as solid. ESI-MS (M+1): 342 calc. for C₁₉H₂₃N₃O₃ 341.

Step 2. 2-azetidin-3-yl-3-(4-methoxy-phenyl)-pyrazine hydrochloride (22)

To a solution of 4 N HCl in MeOH (10 mL) was added (21) (120 mg, 0.35 mmol) at 0° C. and the resulting mixture was stirred at RT for 1 h. The mixture was concentrated under reduced pressure to give 2-azetidin-3-yl-3-(4-methoxy-phenyl)-pyrazine (22) (95 mg, yield 100%) which was used for the next step without further purification. ESI-MS (M+1): 242 calc. for C₁₄H₁₅N₃O 241.

The following Table 4 lists compounds of Preparation P7.1 to P7.6, which were made analogous to Preparation 7 by using the appropriate materials.

TABLE 4 PREPARATION P7.1 TO P7.6 ESI- MS Ex. # Structure Chemical Name (M + 1) P7.1

tert-butyl 3-(3-(4- methoxyphenyl) pyrazin-2-yl) azetidine-1-carboxylate 342 P7.2

tert-butyl 3-(3-(2- methoxyphenyl) pyrazin-2-yl) azetidine-1-carboxylate 342 P7.3

tert-butyl 3-(3- phenylpyrazin-2- yl)azetidine-1- carboxylate 312 P7.4

2-(azetidin-3-yl)- 3-(4-methoxyphenyl) pyrazine hydrochloride 242 P7.5

2-(azetidin-3-yl)- 3-(2-methoxyphenyl) pyrazine hydrochloride 242 P7.6

2-(azetidin-3-yl)-3- phenylpyrazine hydrochloride 212

Preparation 8

Step 1. tert-butyl 3-(2-fluoropyridin-3-yl)azetidine-1-carboxylate (25)

To a 2 L 3 necked round bottomed flask fitted with a mechanical stirrer, under nitrogen atmosphere was placed Zinc dust, which was preactivated according to above Preparation 2, (51.2 g, 0.78 mol, 1.94 eq) and dimethyl acetamide (162 mL). To the above suspension, 1,2-dibromoethane (12.14 g, 0.0646 mol, 0.16 eq) was added dropwise at RT (exotherm and bubbling were observed), followed by dropwise addition of TMSCl (6.99 g, 0.0646 mol, 0.16 eq). A vigorous reaction (exotherm to 55° C.) was observed. To this, a solution of N-Boc-3-iodoazetidine (2) (182.88 g, 0.646 mol, 1.6 eq) in dimethyl acetamide (378 mL) was added dropwise using an addition funnel (exotherm to 50° C. was observed). The suspension was stirred for 1.5 h at RT and was then degassed with nitrogen for 15 min. Stirring was stopped and suspension was allowed to stand under nitrogen. To a 5 L 3 necked round bottomed flask, fitted with mechanical stirrer, flushed with nitrogen were placed 3-iodo-2-fluoropyridine (24) (90 g, 0.404 mol, 1.0 eq), PdCl₂dppf.CH₂Cl₂ (9.88 g, 0.012 mol, 0.03 eq), CuI (4.76 g, 0.025 mol, 0.062 eq) and dimethyl acetamide (396 mL). The red colored suspension was degassed with nitrogen for 15 min.

The Zinc reagent solution in 2 L flask was cannulated into 5 L round bottomed flask. The resulting reaction mixture was degassed again with nitrogen for 15 min with stirring and heated to 80° C. for overnight under nitrogen. LCMS indicates completion of reaction. The reaction was cooled to RT and quenched by addition of brine solution (1 L). To this EtOAc (1 L) and water (1 L) were added and layers were separated. The aqueous layer was extracted with EtOAc (2×2 L). The combined EtOAc layers were washed with water (2 L), brine (1 L), dried (Na₂SO₄), filtered, and evaporated. The crude was purified by column chromatography to give 52 g of tert-butyl 3-(2-fluoropyridin-3-yl)azetidine-1-carboxylate (25) (yield: 51%) as an oil, which solidified on standing.

¹H NMR (300 MHz CDCl₃): 8.13 (doublet, J=4.8 Hz, 1H), 7.83-7.76 (dt, 1H), 7.28-7.20 (dt, 1H), 4.35 (t, J=8.7 Hz, 2H), 4.05-3.88 (m, 3H), 1.46 (s, 9H). LC-MS: 253 (M+1); calcd for C₁₃H₁₇FN₂O₂: 252.28

Step 2. 3-(2-phenyl-pyridin-3-yl)-azetidine-1-carboxylic acid tert-butyl ester (27)

To a solution of 3-(2-fluoro-pyridin-3-yl)-azetidine-1-carboxylic acid tert-butyl ester (25) (200 mg, 0.80 mmol), Ni(acac)₂ (20 mg, 0.08 mmol), DPPF (32 mg, 0.08 mmol) in THF (10 mL) was added PhMgBr (1 M, 0.8 mL, 0.80 mmol). The resulting mixture was heated to reflux overnight under N₂ atmosphere. TLC showed that the staring material was consumed completely. The solution was filtered and the filtrate was concentrated to give the residue, The crude compound was purified by column chromatography on silica gel to give the product 3compound (27) (180 mg, yield 78%) as solid. ESI-MS (M+1): 311 calc. for C₁₉H₂₂N₂O₂ 310.

Step 3. 3-azetidin-3-yl-2-phenyl-pyridine hydrochloride (28)

To a solution of 4 M HCl in MeOH (10 mL) was added 3-(2-phenyl-pyridin-3-yl)-azetidine-1-carboxylic acid tert-butyl ester (27) (180 mg, 0.58 mmol) at 0° C. and the resulting mixture was stirred at RT for 1 h. The mixture was concentrated under reduced pressure to give 3-azetidin-3-yl-2-phenyl-pyridine hydrochloride (28) (120 mg, yield 94%) which was used for the next step without further purification. ESI-MS (M+1): 211 calc. for C₁₄H₁₄N₂ 210.

Preparation 9

Step 1. 3-(3-m-tolyl-pyrazin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (30)

To a solution of 3-(3-chloro-pyrazin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (7) (540 mg, 2.0 mmol, Preparation 2), 3-methyl-phenylboronic acid (78) (299.2 mg, 2.2 mmol), K₃PO₄ (818 mg, 4.0 mmol), in dioxane (20 mL) and water (4 mL) was added Pd(dppf)Cl₂ (73.2 mg, 0.1 mmol) then the reaction mixture was stirred at 90° C. under nitrogen atmosphere overnight. The reaction mixture was filtered through CELITE® and washed with EtOAc (50 mL). The filtrate was concentrated and the crude product was purified by silica gel column to give 3-(3-m-tolyl-pyrazin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (30) (597 mg, 1.84 mmol, yield 91.85%).

ESI-MS (M+1): 326 calc. for C₁₉H₂₃N₃O₂ 325.

Step 2. 2-azetidin-3-yl-3-tolyl-pyrazine hydrochloride (31)

A solution of 3-(3-m-tolyl-pyrazin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (30) (325 mg, 1.0 mmol) in 4N HCl/MeOH (20 mL) was stirred at RT for 30 min. The reaction mixture was concentrated to give (31) (260 mg, 0.99 mmol, yield 99.24%).

ESI-MS (M+1): 226 calc. for C₁₄H₁₅N₃ 225.

Preparation 10

Step 1. 3-[3-(3-methoxy-phenyl)-pyrazin-2-yl]-azetidine-1-carboxylic acid tert-butyl ester (33)

To a solution of 3-(3-chloro-pyrazin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (7) (540 mg, 2.0 mmol, Preparation 2), 3-methoxy-phenylboronic acid (29) (334.4 mg, 2.2 mmol), K₃PO₄ (818 mg, 4.0 mmol), in dioxane (20 mL) and water (4 mL) was added Pd(dppf)Cl₂ (73.2 mg, 0.1 mmol) then the reaction mixture was stirred at 90° C. under nitrogen atmosphere overnight. The reaction mixture was filtered through CELITE® and washed with EtOAc (50 mL). The filtrate was concentrated and the crude product was purified by silica gel column to give compound (33) (627.4 mg, 1.84 mmol, yield 91.85%).

ESI-MS (M+1): 342 calc. for C₁₉H₂₃N₃O₃ 341.

Step 2. 2-azetidin-3-yl-3-(3-methoxy-phenyl)-pyrazine hydrochloride (34)

A solution of (33) (341 mg, 1.0 mmol) in 4N HCl/MeOH (20 mL) was stirred at RT for 30 min. The reaction mixture was concentrated to give (34) (260 mg, 0.99 mmol, yield 99.24%).

ESI-MS (M+1): 242 calc. for C₁₄H₁₅N₃O 241.

Preparation 11

Step 1. 3-[3-(4-hydroxymethyl-piperidin-1-yl)-pyrazin-2-yl]-azetidine-1-carboxylic acid tert-butyl ester (36)

To a solution of compound (7) (540 mg, 2 mmol, Preparation 2) and 4-amino-2-methyl-butan-1-ol (230 mg, 2 mmol) in DMSO (20 mL) was added Et₃N (404 mg, 4 mmol). The reaction mixture was stirred at 110° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (50 mL×3). The combined organic extracts were washed with water (30 mL) and brine (30 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography (EtOAc: Petrol ether=3:1) on silica gel to give (36). (557 mg, 1.6 mmol, yield 80%).

ESI-MS (M+1): 349 calc. for C₁₈H₂₈N₄O₃ 348.

Step 2. [1-(3-azetidin-3-yl-pyrazin-2-yl)-piperidin-4-yl]-methanol hydrochloride (37)

A solution of (36) (557 mg, 1.6 mmol) in 4N HCl/MeOH (20 mL) was stirred at RT for 30 min. The reaction mixture was concentrated to give (37) (450 mg, 1.58 mmol, yield 98%).

ESI-MS (M+1): 249 calc. for C₁₃H₂₀N₄O 248.

Preparation 12

Step 1. 4-(3-chloro-pyrazin-2-yl)-piperidine-1-carboxylic acid tert-butyl ester (39)

A 100 mL 3-neck round bottom flask fitted with a magnetic stirrer and flushed with nitrogen was charged with zinc dust (813 mg, preactivated according to the above Preparation 1, 12.7 mmol, 2.0 eq.) and DMA (10 mL, anhydrous). 1,2-dibromoethane (236 mg, 1.27 mmol, 0.2 eq) was added slowly, followed by TMSCl (137 mg, 1.27 mmol, 0.2 eq). The reaction was stirred for 15 min at RT. A solution of 4-iodo-piperidine-1-carboxylic acid tert-butyl ester (38) (2.95 g, 9.5 mmol, 1.5 eq) in DMA (10 mL, anhydrous) was added dropwise. The suspension was stirred for 1 h at RT.

A 100 mL 3-neck round bottom flask fitted with a mechanical stirrer was charged with 2,3-dichloro-pyrazine (6) (0.95 g, 6.4 mmol, 1.0 eq), Pd(dppf)Cl₂ (446 mg, 0.64 mmol, 0.1 eq), cuprous iodide (121 mg, 0.64 mmol, 0.1 eq), and DMA (20 mL, anhydrous). The dark solution was degassed for 15 min. The clear zinc reagent solution above the residual solid zinc was transferred to the above 100 mL flask by cannulation. The dark solution was degassed and heated to 80° C. for 16 h. The reaction was diluted with brine and extracted with EtOAc (3×100 mL). The combined organics were washed with water (2×100 mL) and brine (100 mL), followed by drying over sodium sulfate. The solution was concentrated and the residue was purified by flash column chromatography on silica gel (PE:EAOAc=2:1) to give the title compound (39) (0.95 g, 3.2 mmol, 50% yield) as a light yellow solid.

ESI-MS (M+1): 298 calc. for C₁₄H₂₀ClN₃O₂ 297.

Step 2. 4-[3-(4-hydroxymethyl-piperidin-1-yl)-pyrazin-2-yl]-piperidine-1-carboxylic acid tert-butyl ester (40)

To a solution of 4-(3-chloro-pyrazin-2-yl)-piperidine-1-carboxylic acid tert-butyl ester (39) (297 mg, 1 mmol) and piperidin-4-yl-methanol (35) (126.5 mg, 1.1 mmol) in DMSO (6 mL) was added Et₃N (202 mg, 2 mmol). The reaction mixture was stirred at 100° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (30 mL×3). The combined organic extracts were washed with water (30 mL) and brine (30 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel to give compound (40) (302 mg, 0.8 mmol, yield 80.32%).

ESI-MS (M+1): 377 calc. for C₂₀H₃₂N₄O₃ 376.

Step 3. [1-(3-piperidin-4-yl-pyrazin-2-yl)-piperidin-4-yl]-methanol hydrochloride (41)

A solution of 4-[3-(4-hydroxymethyl-piperidin-1-yl)-pyrazin-2-yl]-piperidine-1-carboxylic acid tert-butyl ester (40) (376 mg, 1 mmol) in 4N HCl/MeOH (20 mL) was stirred at RT for 30 min. The reaction mixture was concentrated to give (41) (308 mg, 0.98 mmol, yield 98.72%).

ESI-MS (M+1): 277 calc. for C₁₅H₂₄N₄O 276.

Preparation 13

Step 1. 3-[3-(3-methyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidine-1-carboxylic acid tert-butyl ester (43)

To a solution of 3-(3-chloro-pyrazin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (7) (200 mg, 0.74 mmol, Preparation 2) and 3-methyl-pyrrolidine (42) (69.2 mg, 0.84 mmol) in DMSO (5 mL) was added Et₃N (149.5 mg, 1.48 mmol). The reaction mixture was stirred at 100° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (30 mL×3). The combined organic extracts were washed with water (30 mL) and brine (30 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel to give 3-[3-(3-methyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidine-1-carboxylic acid tert-butyl ester (43) (194 mg, 0.56 mmol, yield 75.99%).

ESI-MS (M+1): 319 calc. for C₁₇H₂₆N₄O₂ 318

Step 2. 2-azetidin-3-yl-3-(3-methyl-pyrrolidin-1-yl)-pyrazine hydrochloride (44)

A solution of 3-[3-(3-methyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidine-1-carboxylic acid tert-butyl ester (43) (191 mg, 0.6 mmol) in 4N HCl/MeOH (13 mL) was stirred at RT for 30 min. The reaction mixture was concentrated to give 2-azetidin-3-yl-3-(3-methyl-pyrrolidin-1-yl)-pyrazine hydrochloride (44)

(150 mg, 0.59 mmol, yield 99%).

ESI-MS (M+1): 219 calc. for C₁₂H₁₈N₄ 218

Preparation 14

3-(3-chloro-quinoxalin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (46)

A 100 mL 3-neck round bottom flask fitted with a magnetic stirrer and flushed with nitrogen was charged with zinc dust (1.3 g, preactivated according to the above Preparation 1, 20 mmol, 2.0 eq.) and DMA (10 mL, anhydrous). 1,2-Dibromoethane (400 mg, 2.0 mmol, 0.2 eq) was added slowly, followed by TMSCl (240 mg, 2.0 mmol, 0.2 eq). The reaction was stirred for 15 min at RT. A solution of N-Boc-3-iodoazetidine (2) (4 g, 16 mmol, 1.6 eq) in DMA (10 mL, anhydrous) was added dropwise. The suspension was stirred for 1 h at RT.

A 100 mL 3-neck round bottom flask fitted with a mechanical stirrer was charged with 2,3-dichloro-quinoxaline (44) (2 g, 10 mmol, 1.0 eq), Pd(dppf)Cl₂ (800 mg, 1.0 mmol, 0.1 eq), cuprous iodide (200 mg, 1.0 mmol, 0.1 eq), and DMA (20 mL, anhydrous). The dark solution was degassed for 15 min. The clear zinc reagent solution above the residual solid zinc was transferred to the above 100 mL flask by cannulation. The dark solution was degassed and heated to 80° C. for 16 h. The reaction was diluted with brine and extracted with EtOAc (3×100 mL). The combined organics were washed with water (2×100 mL) and brine (100 mL), followed by drying over sodium sulfate. The solution was concentrated and the residue was purified by flash column chromatography (PE:EAOAc=2:1) provides 3-(3-chloro-quinoxalin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (46) (1.43 g, 4.5 mmol, 45% yield) as a light yellow solid.

ESI-MS (M+1): 320 calc. for C₁₆H₁₈ClN₃O₂ 319.

Preparation 15

Step 1. 3-[3-(4-hydroxymethyl-piperidin-1-yl)-quinoxalin-2-yl]-azetidine-1-carboxylic acid tert-butyl ester (47)

To a solution of 3-(3-chloro-quinoxalin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (46) (638 mg, 2 mmol, Preparation 14) and piperidin-4-yl-methanol (253 mg, 2.2 mmol) in DMSO (10 mL) was added Et₃N (404 mg, 4 mmol). The reaction mixture was stirred at 140° C. in microwave heating for 4 h. The reaction mixture was diluted with water, extracted with EtOAc (30 mL×3). The combined organic extracts were washed with water (30 mL) and brine (30 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel to give (47) (670 mg, 1.68 mmol, yield 84.15%). ESI-MS (M+1): 399 calc. for C₁₇H₂₂N₄O 398.

Step 2. [1-(3-azetidin-3-yl-quinoxalin-2-yl)-piperidin-4-yl]-methanol hydrochloride (48)

A solution of (47) (670 mg, 1.68 mmol) in 4N HCl/MeOH (25 mL) was stirred at RT for 30 min. The reaction mixture was concentrated to give [1-(3-azetidin-3-yl-quinoxalin-2-yl)-piperidin-4-yl]-methanol hydrochloride (48) (560 mg, 1.67 mmol, yield 99%).

ESI-MS (M+1): 299 calc. for C₁₇H₂₂N₄O 298.

Preparation 16

Step 1. 2-azetidin-3-yl-3-chloro-pyrazine hydrochloride (8)

A solution of compound (7) (540 mg, 2.0 mmol) in 2N HCl/MeOH (20 mL) was stirred at RT for 30 min according to Preparation 2. The reaction mixture was concentrated to give compound (8) (440 mg, 1.99 mmol, yield 99.7%).

ESI-MS (M+1): 170 calc. for C₇H₈ClN₃ 169.

Step 2. 4-(3-azetidin-3-yl-pyrazin-2-yl)-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (50)

To a solution of (8) (442 mg, 2.0 mmol), 4-phenylboronic acid-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (49) (679.8 mg, 2.2 mmol), K₃PO₄ (818 mg, 4.0 mmol) in dioxane (20 mL) and water (4 mL) was added Pd(dppf)Cl₂ (73.2 mg, 0.1 mmol) then the reaction mixture was stirred at 90° C. under nitrogen atmosphere overnight. The reaction mixture was filtered through CELITE® and washed with EtOAc (50 mL). The filtrate was concentrated and the crude product was purified by silica gel column to give (50) (540 mg, 1.7 mmol, yield 85%).

ESI-MS (M+1): 317 calc. for C₁₇H₂₄N₄O₂ 316.

Step 3. 4-(3-azetidin-3-yl-pyrazin-2-yl)-piperidine-1-carboxylic acid tert-butyl ester (51)

To a solution of 4-(3-azetidin-3-yl-pyrazin-2-yl)-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (50) (540 mg, 1.7 mmol) in MeOH was added Pd/C (10%, 0.5 g) under nitrogen. The reaction was stirred under hydrogen (30 psi) at RT for 6 h. Filtered to remove Pd/C and concentrated to dryness to give 4-(3-azetidin-3-yl-pyrazin-2-yl)-piperidine-1-carboxylic acid tert-butyl ester (51) (502 mg, 1.58 mmol yield 92.9%).

ESI-MS (M+1): 319 calc. for C₁₇H₂₆N₄O₂ 318.

Step 4. 4-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidine-1-carboxylic acid tert-butyl ester (53)

To a solution of (51) (318 mg, 1 mmol) and 2-chloro-quinoline (52) (163 mg, 1 mmol) in DMF was added Cs₂CO₃ (650 mg, 2 mmol). The reaction mixture was stirred at 100° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (3×20 mL). The combined organic extracts were washed with water (20 mL) and brine (20 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel to give (53) (346 mg, 0.78 mmol, yield 77.8%).

ESI-MS (M+1): 446 calc. for C₂₆H₃₁N₅O₂ 445.

Step 5. 2-[3-(3-piperidin-4-yl-pyrazin-2-yl)-azetidin-1-yl]-quinoline hydrochloride (54)

A solution of 4-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidine-1-carboxylic acid tert-butyl ester (53) (346 mg, 0.78 mmol) in 4N HCl/MeOH (20 mL) was stirred at RT for 30 min. The reaction mixture was concentrated to give the product (54) (294 mg, 0.77 mmol, yield 98.9%).

ESI-MS (M+1): 346 calc. for C₂₁H₂₃N₅ 345.

Preparation 17

Step 1. 3-bromo-5-fluoro-pyridin-2-ylamine (56)

NBS (10 g, 56.2 mmol) was added slowly to a solution of 5-fluoro-pyridin-2-ylamine (55) (12.4 g, 56.2 mmol) in MeCN (200 mL). The reaction mixture was stirred at RT overnight. After completion, the solution was filtered and the filtrate was concentrated to obtain a residue, which was purified by silica gel chromatography (10% to 20% EtOAc in petroleum ether) to give 3-bromo-5-fluoro-pyridin-2-ylamine (56) (5.2 g, 27.2 mmol, 31% yield) as a yellow solid.

ESI-MS (M+1): 191 calc. for C₅H₄BrFN₂ 190.

Step 2. 2,3-dibromo-5-fluoro-pyridine (57)

At 60° C., 3-bromo-5-fluoro-pyridin-2-ylamine (56) (1.91 g, 0.01 mol) was dissolved in 48% hydrobromic acid (30 mL). After cooling to −5° C., bromine (3.24 g, 0.02 mol) was added dropwise over 5 min. A solution of sodium nitrite (1.01 g, 0.02 mol) in water (3 mL) was then added at a rate to keep the temperature of the reaction mixture between −5° C. and 0° C. When finished, the temperature was allowed to reach 25° C. The bromine was reduced with an excess of solid sodium sulfite, and the reaction mixture was extracted with EtOAc (3×50 mL). The combined organic extracts were washed with water (30 mL), brine (30 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel (10% to 20% EtOAc in petroleum ether) to give 2,3-dibromo-5-fluoro-pyridine (57) (1.27 g, 5.0 mmol, 50% yield) as a yellow solid.

ESI-MS (M+1): 254 calc. for C₅H₂Br₂FN 253.

Step 3. 3-(3-bromo-5-fluoro-pyridin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (58)

A 100 mL 3-neck round bottom flask fitted with a magnetic stirrer and flushed with nitrogen was charged with zinc dust (813 mg, preactivated according to the above Preparation 1, 12.7 mmol) and DMA (10 mL, anhydrous). 1,2-dibromoethane (236 mg, 1.27 mmol) was added slowly, followed by TMSCl (137 mg, 1.27 mmol). The reaction was stirred for 15 min at RT. A solution of N-Boc-3-iodoazetidine (2) (2.7 g, 9.5 mmol) in DMA (10 mL, anhydrous) was added dropwise. The suspension was stirred for 1 h at RT.

A 100 mL 3-neck round bottom flask fitted with a mechanical stirrer was charged with 2,3-dibromo-pyridine (57) (1.62 g, 6.4 mmol), Pd(dppf)Cl₂ (446 mg, 0.64 mmol, 0.1 eq), cuprous iodide (121 mg, 0.64 mmol), and DMA (20 mL, anhydrous). The dark solution was degassed for 15 min. The clear zinc reagent solution above the residual solid zinc was transferred to the above 100 mL flask by cannulation. The dark solution was degassed and heated to 80° C. for 16 h. The reaction was diluted with brine and extracted with EtOAc (3×100 mL). The combined organics were washed with water (2×100 mL) and brine (100 mL), followed by drying over sodium sulfate. The solution was concentrated and the residue was purified by flash column chromatography (PE:EtOAc=2:1) provided the title compound (58) (860 mg, 2.6 mmol, 40% yield) as a light yellow solid.

ESI-MS (M+1): 331 calc. for C₁₃H₁₆BrFN₂O₂ 330.

Preparation 18

Step 1. [1-(3,6-dichloro-pyridazin-4-yl)-piperidin-4-yl]-methanol (60)

To a solution of 3,4,6-trichloro-pyridazine (59) (364 mg, 2 mmol) and piperidin-4-yl-methanol (35) (253 mg, 2.2 mmol) in DMSO (5 mL) was added Et₃N (404 mg, 4 mmol). The reaction mixture was stirred at 100° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (30 mL×3). The combined organic extracts were washed with water (30 mL) and brine (30 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel to give [1-(3,6-dichloro-pyridazin-4-yl)-piperidin-4-yl]-methanol (60) (292.3 mg, 1.12 mmol, yield 75.99%).

ESI-MS (M+1): 262 calc. for C₁₀H₁₃Cl₂N₃O 261.

Step 2. 4-[4-(tert-butyl-dimethyl-silanyloxymethyl)-piperidin-1-yl]-3,6-dichloro-pyridazine (61)

[1-(3,6-dichloro-pyridazin-4-yl)-piperidin-4-yl]-methanol (60) (1.83 g, 7 mol) upon treatment with TBSCl (2.1 g, 14 mmol) and imidazole (2.38 g, 35 mmol) in DMF (15 mL) stirred at RT for 3 h, The reaction mixture was diluted with water, extracted with EtOAc (40 mL×3). The combined organic extracts were washed with water (20 mL) and brine (20 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel to give 4-[4-(tert-butyl-dimethyl-silanyloxymethyl)-piperidin-1-yl]-3,6-dichloro-pyridazine (61) (2.55 g, 6.8 mmol, 99% yield)

ESI-MS (M+1): 376 calc. for C₁₆H₂₇Cl₂N₃OSi 375.

Step 3. 3-{4-[4-(tert-butyl-dimethyl-silanyloxymethyl)-piperidin-1-yl]-6-chloro-pyridazin-3-yl}-azetidine-1-carboxylic acid tert-butyl ester (62)

A 100 mL 3-neck round bottom flask fitted with a magnetic stirrer and flushed with nitrogen was charged with zinc dust (813 mg, preactivated according to the above Preparation 1, 12.7 mmol) and DMA (10 mL, anhydrous). 1,2-dibromoethane (236 mg, 1.27 mmol) was added slowly, followed by TMSCl (137 mg, 1.27 mmol). The reaction was stirred for 15 min at RT. A solution of N-Boc-3-iodoazetidine (2) (2.7 g, 9.5 mmol) in DMA (10 mL, anhydrous) was added dropwise. The suspension was stirred for 1 h at RT.

A 100 mL 3-neck round bottom flask fitted with a mechanical stirrer was charged with 4-[4-(tert-butyl-dimethyl-silanyloxymethyl)-piperidin-1-yl]-3,6-dichloro-pyridazine (61) (2.4 g, 6.4 mmol), Pd(dppf)Cl₂ (446 mg, 0.64 mmol), cuprous iodide (121 mg, 0.64 mmol), and DMA (20 mL, anhydrous). The dark solution was degassed for 15 min. The clear zinc reagent solution above the residual solid zinc was transferred to the above 100 mL flask by cannulation. The dark solution was degassed and heated to 80° C. for 16 h. The reaction was diluted with brine and extracted with EtOAc (3×100 mL). The combined organics were washed with water (2×100 mL) and brine (100 mL), followed by drying over sodium sulfate. The solution was concentrated and the residue was purified by flash column chromatography (PE:EAOAc=2:1) provides the title compound (62) (1.25 g, 2.5 mmol, 39% yield) as a light yellow solid.

ESI-MS (M+1): 497 calc. for C₂₄H₄₁ClN₄O₃Si 496.

Step 4. 3-{4-[4-(tert-butyl-dimethyl-silanyloxymethyl)-piperidin-1-yl]-pyridazin-3-yl}-azetidine-1-carboxylic acid tert-butyl ester (63)

To a solution of 3-{4-[4-(tert-butyl-dimethyl-silanyloxymethyl)-piperidin-1-yl]-6-chloro-pyridazin-3-yl}-azetidine-1-carboxylic acid tert-butyl ester (62) (843 mg, 1.7 mmol) in MeOH was added Pd/C (10%, 0.5 g) under nitrogen. The reaction was stirred under hydrogen at RT for 6 h, filtered to remove Pd/C and concentrated to dryness to give 3-{4-[4-(tert-butyl-dimethyl-silanyloxymethyl)-piperidin-1-yl]-pyridazin-3-yl}-azetidine-1-carboxylic acid tert-butyl ester (63) (730 mg, 1.58 mmol yield 92.9%).

ESI-MS (M+1): 463 calc. for C₂₄H₄₂N₄O₃Si 462.

Step 5. [1-(3-azetidin-3-yl-pyridazin-4-yl)-piperidin-4-yl]-methanol hydrochloride (64)

A mixture of 3-{4-[4-(tert-butyl-dimethyl-silanyloxymethyl)-piperidin-1-yl]-pyridazin-3-yl}-azetidine-1-carboxylic acid tert-butyl ester (63) (730 mg, 1.58 mmol) in 4 M HCl/MeOH solution (20 mL) was stirred at RT for 30 min. Then the solvent was evaporated at 40° C. to give [1-(3-azetidin-3-yl-pyridazin-4-yl)-piperidin-4-yl]-methanol hydrochloride (64) (387 mg, 1.56 mmol, 98% yield) as a yellow solid.

ESI-MS (M+1): 249 calc. for C₁₃H₂₀N₄O 248.

Preparation 19

Step 1. 4-dimethylcarbamoyl-piperidine-1-carboxylic acid tert-butyl ester (66)

To a mixture of piperidine-1,4-dicarboxylic acid mono-tert-butyl ester (65) (229 mg, 1 mmol, AalenChem) in DCM (5 mL) was added TEA (202 mg, 2 mmol) and HATU (414 mg, 1.2 mmol). The reaction mixture was stirred for 5 min and dimethylamine hydrochloride (81 mg, 1 mmol) was added. The reaction mixture was stirred at RT overnight. The mixture was diluted with water (10 mL), and extracted with EtOAc (2×20 mL). The combined organic extracts were washed with water (5 mL) and brine (5 mL), dried over Na₂SO₄, and filtered. The filtrate was evaporated in vacuo and the residue was purified by column chromatography to give 4-dimethylcarbamoyl-piperidine-1-carboxylic acid tert-butyl ester (66) (220 mg, 0.85 mmol, 85% yield) as a light yellow oil.

Step 2. piperidine-4-carboxylic acid dimethylamide hydrochloride (67)

A solution of 4-dimethylcarbamoyl-piperidine-1-carboxylic acid tert-butyl ester (66) (220 mg, 0.85 mmol) in 4N HCl/MeOH (20 mL) was stirred at RT for 30 min. The reaction mixture was concentrated to give the product piperidine-4-carboxylic acid dimethylamide hydrochloride (67) (163 mg, 0.85 mmol, yield 99.9%).

ELSD-MS (M+1): 157 calc. for C₈H₁₆N₂O 156.

The following Table 5 lists compounds of Preparation P19.1 to P19.4, which were made analogous to Preparation 19 by using the appropriate materials.

TABLE 5 PREPARATION P19.1 TO P19.4 ESI- MS Chemical (M + Ex. # Chemical Structure Name 1) P19.1

4-Dimethyl- carbamoyl- piperidine-1- carboxylic acid tert- butyl ester 257 P19.2

4-methyl- carbamoyl- piperidine-1- carboxylic acid tert- butyl ester 243 P19.3

Piperidine- 4-carboxylic acid dimethyl- amide hydro- chloride 157 P19.4

Piperidine-4- carboxylic acid methyl- amide hydro- chloride 143

Preparation 20

Step 1. 3-(3-m-tolyl-quinoxalin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester

To a solution of 3-(3-chloro-quinoxalin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (46) (639 mg, 2.0 mmol, as prepared in the above Preparation 14), 3-methyl-phenylboronic acid (68) (299.2 mg, 2.2 mmol), K₃PO₄ (818 mg, 4.0 mmol) in dioxane (20 mL) and water (4 mL) was added Pd(dppf)Cl₂ (73.2 mg, 0.1 mmol) then the reaction mixture was stirred at 90° C. under nitrogen atmosphere overnight. The reaction mixture was filtered through CELITE® and washed with EtOAc (50 mL). The filtrate was concentrated and the crude product was purified by silica gel column to give 3-(3-m-tolyl-quinoxalin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (69) (637 mg, 1.7 mmol, yield 85%).

ESI-MS (M+1): 376 calc. for C₂₃H₂₅N₃O₂ 375.

Step 2. 2-azetidin-3-yl-3-m-tolyl-quinoxaline hydrochloride (70)

A solution of 3-(3-m-tolyl-quinoxalin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (69) (637 mg, 1.7 mmol) in 4N HCl/MeOH (25 mL) was stirred at RT for 30 min. The reaction mixture was concentrated to give 2-azetidin-3-yl-3-m-tolyl-quinoxaline hydrochloride (70) (523 mg, 1.68 mmol, yield 98.8%).

ESI-MS (M+1): 276 calc. for C₁₈H₁₇N₃ 275.

The following Table 6 lists compounds of Preparation P20.1 to P20.10, which were made analogous to Preparation 20 by using the appropriate materials.

TABLE 6 PREPARATION P20.1 TO P20.10 Ex. # Chemical Structure Chemical Name ESI-MS (M + 1) P20.1

3-(3-m-Tolyl-quinoxalin-2-yl)- azetidine-1-carboxylic acid tert- butyl ester 376 P20.2

tert-butyl 3-(3-(4- aminophenyl)quinoxalin-2- yl)azetidine-1-carboxylic 376 P20.3

tert-butyl 3-(3-(3- hydroxyphenyl)quinoxalin-2- yl)azetidine-1-carboxylate 378 P20.4

tert-butyl 3-(3-(3- methoxyphenyl)quinoxalin-2- yl)azetidine-1-carboxylate 392 P20.5

tert-butyl 3-(3- phenylquinoxalin-2- yl)azetidine-1-carboxylate 362 P20.6

2-Azetidin-3-yl-3-m-tolyl- quinoxaline hydrochloride 276 P20.7

4-(3-(azetidin-3-yl)quinoxalin- 2-yl)aniline hydrochloride 277 P20.8

3-(3-(azetidin-3-yl)quinoxalin- 2-yl)phenol hydrochloride 278 P20.9

2-(azetidin-3-yl)-3-(3- methoxyphenyl)quinoxaline hydrochloride 292 P20.10

2-(azetidin-3-yl)-3- phenylquinoxaline hydrochloride 262

Preparation 21

Step 1. 3-[3-(2-hydroxy-phenyl)-pyrazin-2-yl]-azetidine-1-carboxylic acid tert-butyl ester (72)

To a solution of 3-(3-chloro-pyrazin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (7) (540 mg, 2.0 mmol, see Preparation 2), 2-hydroxy-phenylboronic acid (71) (303.6 mg, 2.2 mmol), K₃PO₄ (818 mg, 4.0 mmol), in dioxane (20 mL) and water (4 mL) was added Pd(dppf)Cl₂ (73.2 mg, 0.1 mmol) then the reaction mixture was stirred at 90° C. under nitrogen atmosphere overnight. The reaction mixture was filtered through CELITE® and washed with EtOAc (50 mL). The filtrate was concentrated and the crude product was purified by silica gel column to give (72) (601.7 mg, 1.84 mmol, yield 91.85%).

ESI-MS (M+1): 328 calc. for C₁₈H₂₁N₃O₃ 327.

Step 2. 2-(3-azetidin-3-yl-pyrazin-2-yl)-phenol hydrochloride (73)

A solution of 3-[3-(2-hydroxy-phenyl)-pyrazin-2-yl]-azetidine-1-carboxylic acid tert-butyl ester (72) (325 mg, 1.0 mmol) in 4N HCl/MeOH (20 mL) was stirred at RT for 30 min. The reaction mixture was concentrated to give (74) (274.3 mg, 0.99 mmol, yield 99.24%).

ESI-MS (M+1): 228 calc. for C₁₃H₁₃N₃O 227.

The following Table 7 lists compounds of Preparation P21.1 to P21.8, which were made analogous to Preparation 21 by using the appropriate materials.

TABLE 7 PREPARATION P21.1 TO P21.8 Chemical ESI-MS Ex. # Chemical Structure Name (M + 1) P21.1

2-(3-azetidin-3-yl) pyrazin-2- yl)phenol hydrochloride 228 P21.2

3-(3-(azetidin-3- yl)pyrazin-2- yl)phenol hydrochloride 228 P21.3

4-(3-(azetidin-3- yl)pyrazin-2- yl)phenol hydrochloride 228 P21.4

2-(3-(azetidin-3- yl)-pyrazin-2- yl)aniline hydrochloride 226 P21.5

3-(3-(azetidin-3- yl)pyrazin-2- yl)aniline hydrochloride 226 P21.6

4-(3-(azetidin-3- yl)pyrazin-2- yl)aniline hydrochloride 226 P21.7

2-(azetidin-3- yl)-3-(4-fluoro-3- methoxyphenyl) pyrazine hydrochloride 260 P21.8

4-(3-(azetidin-3- yl)pyrazin-2- yl)-2- fluoroaniline hydrochloride 245

Preparation 22

Step 1. tert-butyl 3-(3-(piperidin-1-yl)pyrazin-2-yl)azetidine-1-carboxylate (74)

To a solution of 3-(3-chloro-pyrazin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (7) (200 mg, 0.74 mmol, see Preparation 2) and piperidine (69.2 mg, 0.84 mmol) in DMSO (5 mL) was added Et₃N (149.5 mg, 1.48 mmol). The reaction mixture was stirred at 100° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (30 mL×3). The combined organic extracts were washed with water (30 mL) and brine (30 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel to give tert-butyl 3-(3-(piperidin-1-yl)pyrazin-2-yl)azetidine-1-carboxylate (74). (194 mg, 0.56 mmol, yield 75.99%).

Step 2. 2-azetidin-3-yl-3-piperidin-1-yl-pyrazine hydrochloride (75)

A solution of 3-(3-piperidin-1-yl-pyrazin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (74) (191 mg, 0.6 mmol) in 4N HCl/MeOH (13 mL) was stirred at RT for 30 min. The reaction mixture was concentrated to give (75) (150 mg, 0.59 mmol, yield 99%). ESI-MS (M+1): 219 calc. for C₁₂H₁₈N₄ 218

The following Table 8 lists compounds of Preparation P22.1 to P22.12, which were made analogous to Preparation 22 by using the appropriate materials.

TABLE 8 PREPARATION P22.1 TO P22.12 ESI- MS Chemical (M + Ex. # Chemical Structure Name 1) P22.1

tert-butyl 3- (3-(piperidin-1- yl)pyrazin-2- yl)azetidine-1- carboxylate 319 P22.2

tert-butyl 3- (3-(4- methyl- piperidin- 1-yl)pyrazin- 2-yl)azetidine- 1-carboxylate 333 P22.3

tert-butyl 3- (3-(4- carbamoyl- piperidin-1- yl)pyrazin-2- yl)azetidine-1- carboxylate 362 P22.4

tert-butyl 3- (3-(4- (dimethyl- carbamoyl) piperidin- 1-yl)pyrazin-2- yl)azetidine-1- carboxylate 390 P22.5

tert-butyl 3- (3-(4- (methyl- carbamoyl) piperidin-1- yl)pyrazin-2-yl) azetidine-1- carboxylate 376 P22.6

tert-butyl 3- (3-(4- acetylpiperazin- 1-yl)pyrazin-2- yl)azetidine-1- carboxylate 362 P22.7

2-(azetidin-3- yl)-3-(piperidin- 1-yl)pyrazine hydrochloride 219 P22.8

2-(azetidin-3- yl)-3-(4- methylpiperidin- 1-yl)pyrazine hydrochloride 233 P22.9

1-(3-(azetidin-3- yl)pyrazin-2- yl)piperidine- 4-carboxamide hydrochloride 262 P22.10

1-(3-(azetidin-3- yl)pyrazin-2- yl)-N,N- dimethyl- piperidine-4- carboxamide hydrochloride 290 P22.11

1-(3-(azetidin- 3-yl)pyrazin-2- yl)-N-methyl- piperidine-4- carboxamide hydrochloride 276 P22.12

1-(4-(3-(azetidin- 3-yl)pyrazin- 2-yl)piperazin- 1-yl)ethanone hydrochloride 262

Preparation 23

Step 1. 3-(5′-fluoro-4-hydroxymethyl-3,4,5,6-tetrahydro-2H-[1,3′]bipyridinyl-2′-yl)-azetidine-1-carboxylic acid tert-butyl ester (76)

To a solution of 3-(3-bromo-5-fluoro-pyridin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (58) (660 mg, 2 mmol, Preparation 17) and piperidin-4-yl-methanol (35) (230 mg, 2 mmol) in DMSO (20 mL) was added Et₃N (404 mg, 4 mmol). The reaction mixture was stirred at 100° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (50 mL×3). The combined organic extracts were washed with water (30 mL) and brine (30 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography (EtOAc:PE=3:1) on silica gel to give (76) (490 mg, 1.34 mmol, yield 67%). ESI-MS (M+1): 366 calc. for C₁₉H₂₈FN₃O₃ 365.

Step 2. (2′-azetidin-3-yl-5′-fluoro-3,4,5,6-tetrahydro-2H-[1,3′]bipyridinyl-4-yl)-methanol hydrochloride (77)

A mixture of 3-(5′-fluoro-4-hydroxymethyl-3,4,5,6-tetrahydro-2H-[1,3′]bipyridinyl-2′-yl)-azetidine-1-carboxylic acid tert-butyl ester (76) (490 mg, 1.34 mmol) in 4 M HCl/MeOH solution (10 mL) was stirred at RT for 30 min. Then the solvent was evaporated at 40° C. to give (77) (392 mg, 1.3 mmol, 98% yield) as a yellow solid. ESI-MS (M+1): 266 calc. for C₁₄H₂₀FN₃O 265.

Preparation 24

Step 1. 3-(3-bromo-pyridin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (3)

A 100 mL 3-neck round bottom flask fitted with a magnetic stirrer and flushed with nitrogen was charged with zinc dust (813 mg, preactivated according to the above Preparation 1, 12.7 mmol, 2.0 eq.) and DMA (10 mL, anhydrous). 1,2-Dibromoethane (236 mg, 1.27 mmol, 0.2 eq) was added slowly, followed by TMSCl (137 mg, 1.27 mmol, 0.2 eq). The reaction was stirred for 15 min at RT. A solution of N-Boc-3-iodoazetidine (2) (2.7 g, 9.5 mmol, 1.5 eq) in DMA (10 mL, anhydrous) was added dropwise. The suspension was stirred for 1 h at RT.

A 100 mL 3-neck round bottom flask fitted with a mechanical stirrer was charged with 2,3-dibromo-pyridine (1) (1.5 g, 6.4 mmol, 1.0 eq), PdCl₂(dppf) (446 mg, 0.64 mmol, 0.1 eq), CuI (121 mg, 0.64 mmol, 0.1 eq), and DMA (20 mL, anhydrous). The dark solution was degassed for 15 min. The clear zinc reagent solution above the residual solid zinc was transferred to the above 100 mL flask by cannulation. The dark solution was degassed and heated to 80° C. for 16 h. The reaction was diluted with brine and extracted with EtOAc (3×100 mL). The combined organics were washed with water (2×100 mL) and brine (100 mL), followed by drying over sodium sulfate. The solution was concentrated and the residue was purified by flash column chromatography (PE:EtOAc=2:1) provides the title compound (3) (600 mg, 31% yield) as a light yellow solid.

ESI-MS (M+1): 313 calc. for C₁₃H₁₇BrN₂O₂ 312.

Step 2. 3-(3-phenyl-pyridin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (79)

To a stirred solution of 3-(3-bromo-pyridin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (3) (150 mg, 0.48 mmol) in dioxane (10 mL) was added phenylboronic acid (78) (87 mg, 0.71 mmol), Na₂CO₃ (152 mg, 1.4 mmol) and H₂O (2 mL). The reaction mixture was degassed with N₂ and then PdCl₂(dppf) (35 mg, 0.05 mmol) was added. The reaction mixture was stirred at 80° C. for 12 h. The reaction mixture was left to reach RT and filtered through a pad of CELITE® and the filter cake was washed with CH₂Cl₂ (20 mL×3). The combined filtrates were evaporated in vacuo and the residue was purified by column chromatography ((EtOAc:Petrol ether=3:1) to give the desired compound (79) (130 mg, 87% yield). ESI-MS (M+1): 311 calc. for C₁₉H₂₂N₂O₂ 310.

Step 3. 2-azetidin-3-yl-3-phenyl-pyridine hydrochloride

A mixture of 3-(3-phenyl-pyridin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (79) (130 mg, 0.60 mmol) in HCl/MeOH solution (5 mL) was stirred at RT for 30 min. Then the solvent was evaporated at 40° C. to give 2-Azetidin-3-yl-3-phenyl-pyridine hydrochloride (80) (100 mg, 100% yield) as a yellow solid.

ESI-MS (M+1): 211 calc. for C₁₄H₁₄N₂ 210.

Preparation 25

Step 1. 1-methyl-1H-benzoimidazole-2-carboxylic acid methyl ester (81)

To a solution of 1H-benzoimidazole-2-carboxylic acid methyl ester (18) (177 mg, 1.0 mmol) in dry DMF (5 mL) was added sodium hydride (applied as 60% dispersion in oil, 62 mg, 1.5 mmol)) at 0° C. under N₂ atmosphere. After 0.5 h, iodomethane (284 mg, 2.0 mmol) was added slowly. The reaction mixture was stirred at RT for 4 h. The reaction was diluted with brine at 0° C. and extracted with EtOAc (3×20 mL). The combined organics were washed with water (2×15 mL), brine (20 mL), dried over sodium sulfate and filtered. The filtrate was concentrated and purified by flash column chromatography to provide the title compound (81) (180 mg, 90% yield) as a light yellow solid.

ESI-MS (M+1): 191 calc. for C10H10N2O2 190.

Step 2. 1-methyl-1H-benzoimidazole-2-carboxylic acid (82)

A mixture of 1-methyl-1H-benzoimidazole-2-carboxylic acid methyl ester (81) (190 mg, 1.0 mmol) and NaOH (80 mg, 2.0 mmol) in MeOH/H₂O (1:1, 20 mL) was stirred at 50° C. for 1 h. The mixture was concentrated, then diluted with water (15 mL), adjusted pH=2 with concentrated HCl. Then the precipitate was formed and filtered, washed with water and dried to give 1-methyl-1H-benzoimidazole-2-carboxylic acid (82) (176 mg, 1.0 mmol, yield 100%)

ESI-MS (M+1): 177 calc. for C₉H₈N₂O₂ 176.

Step 3. [3-(3-chloro-pyrazin-2-yl)-azetidin-1-yl]-(1-methyl-1H-benzoimidazol-2-yl)-methanone (83)

A mixture of 1-methyl-1H-benzoimidazole-2-carboxylic acid (82) (176 mg, 1.0 mmol), 2-Azetidin-3-yl-3-chloro-pyrazine hydrochloride (8) (169 mg, 1.0 mmol), HOBt (151 mg, 1.2 mmol), EDCI (231 mg, 1.2 mmol) and N-methyl-morpholine (NMM) (300 mg, 3.0 mmol) in DMF (5 mL) was stirred at RT for 24 h. The mixture was diluted with water (20 mL), and filtered. The filter cake was washed with water and dried in vacuo to provide [3-(3-chloro-pyrazin-2-yl)-azetidin-1-yl]-(1-methyl-1H-benzoimidazol-2-yl)-methanone (83) (300 mg, yield 90%).

ESI-MS (M+1): 328 calc. for C₁₆H₁₄ClN₅O 327.

Preparation 26

[3-(3-chloro-pyrazin-2-yl)-azetidin-1-yl]-[1-(2,2,2-trifluoro-ethyl)-1H-benzoimidazol-2-yl]-methanone (85)

To a solution of (1H-benzoimidazol-2-yl)-[3-(3-chloro-pyrazin-2-yl)-azetidin-1-yl]-methanone (84), as prepared in Preparation 36 below, (314 mg, 1.0 mmol) in dry DMF (10 mL) was added sodium hydride (applied as 60% dispersion in oil, 62 mg, 1.5 mmol)) at 0° C. under N₂ atmosphere. After 0.5 h, 1,1,1-Trifluoro-2-iodo-ethane (418 mg, 2.0 mmol) was added slowly. The reaction mixture was stirred at RT for 4 h. The reaction was quenched with water (10 mL) at 0° C. and extracted with EtOAc (3×20 mL). The combined organics were washed with water (2×15 mL), brine (20 mL), dried over sodium sulfate and filtered. The filtrate was concentrated and the residue was purified by flash column chromatography to provide (85) (355 mg, 0.90 mmol, 90% yield) as white solid.

ESI-MS (M+1): 396 calc. for C₁₇H₁₃ClF₃N₅O 395.

Preparation 27

Step 1. 3-(3-phenyl-pyridin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (86)

To a stirred solution of 3-(3-bromo-pyridin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (3) (158 mg, 0.48 mmol) in dioxane (10 mL) was added phenylboronic acid (78) (87 mg, 0.71 mmol), Na₂CO₃ (152 mg, 1.4 mmol) and H₂O (2 mL). The reaction mixture was degassed with N₂ and then PdCl₂(dppf) (35 mg, 0.05 mmol) was added. The reaction mixture was stirred at 80° C. for 12 h. The reaction mixture was left to reach RT and filtered through a pad of CELITE® and the filter cake was washed with CH₂Cl₂ (20 mL×3). The combined filtrates were evaporated in vacuo and the residue was purified by column chromatography ((EtOAc:Petrol ether=3:1) to give 3-(3-phenyl-pyridin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (125 mg, 0.38 mmol, 80% yield).

ESI-MS (M+1): 329 calc. for C₁₉H₂₁FN₂O₂ 328.

Step 2. 2-azetidin-3-yl-5-fluoro-3-phenyl-pyridine hydrochloride (87)

A mixture of 3-(3-phenyl-pyridin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (86) (125 mg, 0.38 mmol) in 4 M HCl/MeOH solution (10 mL) was stirred at RT for 30 min. Then the solvent was evaporated at 40° C. to give 2-azetidin-3-yl-5-fluoro-3-phenyl-pyridine hydrochloride (87) (100 mg, 0.38 mmol, 100% yield) as a yellow solid.

ESI-MS (M+1): 229 calc. for C₁₄H₁₃FN₂ 228.

Preparation 28

Step 1. 4-(3-chloro-pyrazin-2-yl)-piperidine-1-carboxylic acid tert-butyl ester (88)

A 100 mL 3-neck round bottom flask fitted with a magnetic stirrer and flushed with nitrogen was charged with zinc dust (813 mg, preactivated according to the above Preparation 1, 12.7 mmol, 2.0 eq.) and DMA (10 mL, anhydrous). 1,2-dibromoethane (236 mg, 1.27 mmol, 0.2 eq) was added slowly, followed by TMSCl (137 mg, 1.27 mmol, 0.2 eq). The reaction was stirred for 15 min at RT. A solution of 4-iodo-piperidine-1-carboxylic acid tert-butyl ester (38) (2.95 g, 9.5 mmol, 1.5 eq) in DMA (10 mL, anhydrous) was added dropwise. The suspension was stirred for 1 h at RT.

A 100 mL 3-neck round bottom flask fitted with a mechanical stirrer was charged with 2,3-dichloro-pyrazine (6) (0.95 g, 6.4 mmol, 1.0 eq), PdCl₂(dppf) (446 mg, 0.64 mmol, 0.1 eq), CuI (121 mg, 0.64 mmol, 0.1 eq), and DMA (20 mL, anhydrous). The dark solution was degassed for 15 min. The clear zinc reagent solution above the residual solid zinc was transferred to the above 100 mL flask by cannulation. The dark solution was degassed and heated to 80° C. for 16 h. The reaction was diluted with brine and extracted with EtOAc (3×100 mL). The combined organics were washed with water (2×100 mL) and brine (100 mL), followed by drying over sodium sulfate. The solution was concentrated and the residue was purified by flash column chromatography (PE:EA=2:1) provides the title compound (88) (0.95 g, 3.2 mmol, 50% yield) as a light yellow solid.

ESI-MS (M+1): 298 calc. for C₁₄H₂₀ClN₃O₂ 297.

Step 4. 4-(3-phenyl-pyrazin-2-yl)-piperidine-1-carboxylic acid tert-butyl ester (89)

To a stirred solution of (88) (142 mg, 0.48 mmol) in dioxane (10 mL) was added phenylboronic acid (78) (87 mg, 0.71 mmol), Na₂CO₃ (152 mg, 1.4 mmol) and H₂O (2 mL). The reaction mixture was degassed with N₂ and then PdCl₂(dppf) (35 mg, 0.05 mmol) was added. The reaction mixture was stirred at 80° C. for 12 h. The reaction mixture was left to reach RT and filtered through a pad of CELITE® and the filter cake was washed with CH₂Cl₂ (20 mL×3). The combined filtrates were evaporated in vacuo and the residue was purified by column chromatography ((EtOAc:Petrol ether=1:1) to give 4-(3-Phenyl-pyrazin-2-yl)-piperidine-1-carboxylic acid tert-butyl ester (89) (128 mg, 0.38 mmol, 80% yield).

ESI-MS (M+1): 340 calc. for C₂₀H₂₅N₃O₂ 339.

Step 4. 2-phenyl-3-piperidin-4-yl-pyrazine hydrochloride (90)

A mixture of 4-(3-Phenyl-pyrazin-2-yl)-piperidine-1-carboxylic acid tert-butyl ester (89) (128 mg, 0.38 mmol) in 4 M HCl/MeOH solution (10 mL) was stirred at RT. for 30 min. Then the solvent was evaporated at 40° C. to give 2-phenyl-3-piperidin-4-yl-pyrazine hydrochloride (90) (105 mg, 0.38 mmol, 100% yield) as a yellow solid.

ESI-MS (M+1): 240 calc. for C₁₅H₁₇N₃ 239.

Preparation 29

Step 1. 3-(3-chloro-quinoxalin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (91)

A 100 mL 3-neck round bottom flask fitted with a magnetic stirrer and flushed with nitrogen was charged with zinc dust (1.3 g, preactivated according to the above Preparation 1, 20 mmol, 2.0 eq.) and DMA (10 mL, anhydrous). 1,2-dibromoethane (400 mg, 2.0 mmol, 0.2 eq) was added slowly, followed by TMSCl (240 mg, 2.0 mmol, 0.2 eq). The reaction was stirred for 15 min at RT. A solution of N-Boc-3-iodoazetidine (2) (4 g, 16 mmol, 1.6 eq) in DMA (10 mL, anhydrous) was added dropwise. The suspension was stirred for 1 h at RT.

A 100 mL 3-neck round bottom flask fitted with a mechanical stirrer was charged with 2,3-Dichloro-quinoxaline (44) (2 g, 10 mmol, 1.0 eq), PdCl₂(dppf) (800 mg, 1.0 mmol, 0.1 eq), CuI (200 mg, 1.0 mmol, 0.1 eq), and DMA (20 mL, anhydrous). The dark solution was degassed for 15 min. The clear zinc reagent solution above the residual solid zinc was transferred to the above 100 mL flask by cannulation. The dark solution was degassed and heated to 80° C. for 16 h. The reaction was diluted with brine and extracted with EtOAc (3×100 mL). The combined organics were washed with water (2×100 mL) and brine (100 mL), followed by drying over sodium sulfate. The solution was concentrated and the residue was purified by flash column chromatography (PE:EA=2:1) provides 3-(3-Chloro-quinoxalin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (91) (1.43 g, 4.5 mmol, 45% yield) as a light yellow solid.

ESI-MS (M+1): 320 calc. for C₁₆H₁₈ClN₃O₂ 319.

Step 2. 3-(3-piperidin-1-yl-quinoxalin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (92)

To a mixture of 3-(3-chloro-quinoxalin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (91) (0.16 g, 0.50 mmol) and piperidine (0.085 g, 1.0 mmol) was added triethylamine (0.10 g, 1.0 mmol) and DMSO (3 mL). The solution was heated to 160° C. in microwave for 2 h. Then the mixture was diluted with water (10 mL) and extracted with EtOAc (2×20 mL). The combined organic extracts were washed with water (10 mL) and brine (10 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel (20% to 50% EtOAc in petroleum ether) to give 3-(3-piperidin-1-yl-quinoxalin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (92) (0.16 g, 0.90 mmol, 90% yield) as a white solid. ESI-MS (M+1): 369 calc. for C₂₁H₂₈N₄O₂ 368.

Step 3. 2-azetidin-3-yl-3-piperidin-1-yl-quinoxaline hydrochloride (93)

A mixture of 3-(3-piperidin-1-yl-quinoxalin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (92) (139 mg, 0.38 mmol) in 4 M HCl/MeOH solution (10 mL) was stirred at RT for 30 min. Then the solvent was evaporated at 40° C. to give 2-azetidin-3-yl-3-piperidin-1-yl-quinoxaline hydrochloride (93) (115 mg, 0.38 mmol, 100% yield) as a yellow solid. ESI-MS (M+1): 269 calc. for C₁₆H₂₀N₄ 269

The following Table 9 lists compounds of Preparation P29.1 to P29.4, which were made analogous to Preparation 29 by using the appropriate materials.

TABLE 9 PREPARATION P29.1 TO P29.4 Ex. # Structure Chemical Name ESI-MS (M + 1) P29.1

3-(3-Piperidin-1-yl-quinoxalin-2-yl)- azetidine-1-carboxylic acid tert-butyl ester 369 P29.2

tert-butyl 3-(3-(4-hydroxypiperidin-1- yl)quinoxalin-2-yl)azetidine-1- carboxylate 385 P29.3

2-Azetidin-3-yl-3-piperidin-1-yl- quinoxaline hydrochloride 269 P29.4

1-(3-(azetidin-3-yl)quinoxalin-2- yl)piperidin-4-ol hydrochloride 285

Preparation 30

Step 1. 3-(2,3-dihydro-indol-1-yl)-3′,4′,5′,6′-tetrahydro-2′H-[2,4′]bipyridinyl-1′-carboxylic acid tert-butyl ester (95)

A mixture of 3-bromo-3′,4′,5′,6′-tetrahydro-2′H-[2,4′]bipyridinyl-1′-carboxylic acid tert-butyl ester (94) (280 mg, 0.82 mmol), 2,3-dihydro-1H-indole (97 mg, 0.82 mmol), Pd₂(dba)₃ (37 mg, 0.04 mmol), BINAP (24 mg, 0.04 mmol) and t-BuONa (173 mg, 1.64 mmol) in toluene (20 mL) was stirred at 100° C. for 12 h. The mixture was left to reach RT and filtered through a pad of Celite and the filter cake was washed with CH₂Cl₂ (30 mL). The combine filtrate was evaporated in vacuo and the residue was purified by flash column chromatography (20% to 40% EtOAc in petroleum ether) to afford 3-(2,3-dihydro-indol-1-yl)-3′,4′,5′,6′-tetrahydro-2′H-[2,4′]bipyridinyl-1′-carboxylic acid tert-butyl ester (95) (100 mg, 0.29 mmol, yield 32%).

ESI-MS (M+1): 380 calc. for C₂₃H₂₉N₃O₂ 379.

Step 2. 3-(2,3-dihydro-indol-1-yl)-1′,2′,3′,4′,5′,6′-hexahydro-[2,4′]bipyridinyl hydrochloride (96)

To 3-(2,3-dihydro-indol-1-yl)-3′,4′,5′,6′-tetrahydro-2′H-[2,4′]bipyridinyl-1′-carboxylic acid tert-butyl ester (95) (100 mg, 0.29 mmol) was added 4 M HCl in MeOH (20 mL). The reaction mixture was stirred at RT for 1 h. Then it was concentrated to give 3-(2,3-dihydro-indol-1-yl)-1′,2′,3′,4′,5′,6′-hexahydro-[2,4′]bipyridinyl hydrochloride (96) (0.083 g, 0.29 mmol, 100% yield) which was used in the next step without further purification.

ESI-MS (M+1): 280 calc. for C₁₈H₂₁N₃ 279.

Preparation 31

Step 1. 3-(3-bromo-quinolin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (98)

A 100 mL 3-neck round bottom flask fitted with a magnetic stirrer and flushed with nitrogen was charged with zinc dust (813 mg, preactivated according to the above Preparation 1, 12.7 mmol, 2.0 eq.) and DMA (10 mL, anhydrous). 1,2-dibromoethane (236 mg, 1.27 mmol, 0.2 eq) was added slowly, followed by TMSCl (137 mg, 1.27 mmol, 0.2 eq). The reaction was stirred for 15 min at RT. A solution of N-Boc-3-iodoazetidine (2) (2.7 g, 9.5 mmol, 1.5 eq) in DMA (10 mL, anhydrous) was added dropwise. The suspension was stirred for 1 h at RT.

A 100 mL 3-neck round bottom flask fitted with a mechanical stirrer was charged with 2,3-dibromo-quinoline (97) (1.82 g, 6.4 mmol, 1.0 eq), PdCl₂(dppf) (446 mg, 0.64 mmol, 0.1 eq), CuI (121 mg, 0.64 mmol, 0.1 eq), and DMA (20 mL, anhydrous). The dark solution was degassed for 15 min. The clear zinc reagent solution above the residual solid zinc was transferred to the above 100 mL flask by cannulation. The dark solution was degassed and heated to 80° C. for 16 h. The reaction was diluted with brine and extracted with EtOAc (3×100 mL). The combined organics were washed with water (2×100 mL) and brine (100 mL), followed by drying over sodium sulfate. The solution was concentrated and the residue was purified by flash column chromatography (EtOAc:Petro ether=4:1) provides the title compound (98) (1.2 g, 3.30 mmol, 52% yield) as a light yellow solid.

ESI-MS (M+1): 363 calc. for C₁₇H₁₉BrN₂O₂ 362.

Step 2. 3-(3-phenyl-quinolin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (99)

To a stirred solution of 3-(3-bromo-quinolin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (98) (174 mg, 0.48 mmol) in dioxane (10 mL) was added phenylboronic acid (78) (87 mg, 0.71 mmol), Na₂CO₃ (152 mg, 1.4 mmol) and H₂O (2 mL). The reaction mixture was degassed with N₂ and then PdCl₂(dppf) (35 mg, 0.05 mmol) was added. The reaction mixture was stirred at 80° C. for 12 h. The reaction mixture was left to reach RT and filtered through a pad of CELITE® and the filter cake was washed with CH₂Cl₂ (20 mL×3). The combined filtrates were evaporated in vacuo and the residue was purified by column chromatography ((EtOAc:Petrol ether=3:1) to give the desired compound (95) (154 mg, 0.42 mmol, 87% yield).

ESI-MS (M+1): 361 calc. for C₂₃H₂₄N₂O₂ 360.

Step 3. 2-azetidin-3-yl-3-phenyl-quinoline hydrochloride (100)

A mixture of 3-(3-phenyl-pyridin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (99) (216 mg, 0.60 mmol) in 4 M HCl/MeOH solution (10 mL) was stirred at RT. for 30 min. Then the solvent was evaporated at 40° C. to give 2-azetidin-3-yl-3-phenyl-pyridine (100) (177 mg, 100% yield) as a yellow solid.

ESI-MS (M+1): 261 calc. for C₁₈H₁₆N₂ 260.

Preparation 32

Step 1. 3-bromo-3′,4′,5′,6′-tetrahydro-2′H-[2,4′]bipyridinyl-1′-carboxylic acid tert-butyl ester (101)

A 100 mL 3-neck round bottom flask fitted with a magnetic stirrer and flushed with nitrogen was charged with zinc dust (813 mg, preactivated according to the above Preparation 1, 12.7 mmol, 2.0 eq.) and DMA (10 mL, anhydrous). 1,2-dibromoethane (236 mg, 1.27 mmol, 0.2 eq) was added slowly, followed by TMSCl (137 mg, 1.27 mmol, 0.2 eq). The reaction was stirred for 15 min at RT. A solution of 4-Iodo-piperidine-1-carboxylic acid tert-butyl ester (38) (2.95 g, 9.5 mmol, 1.5 eq) in DMA (10 mL, anhydrous) was added dropwise. The suspension was stirred for 1 h at RT.

A 100 mL 3-neck round bottom flask fitted with a mechanical stirrer was charged with 2,3-dibromo-pyridine (1) (1.5 g, 6.4 mmol, 1.0 eq), PdCl₂(dppf) (446 mg, 0.64 mmol, 0.1 eq), CuI (121 mg, 0.64 mmol, 0.1 eq), and DMA (20 mL, anhydrous). The dark solution was degassed for 15 min. The clear zinc reagent solution above the residual solid zinc was transferred to the above 100 mL flask by cannulation. The dark solution was degassed and heated to 80° C. for 16 h. The reaction was diluted with brine and extracted with EtOAc (3×100 mL). The combined organics were washed with water (2×100 mL) and brine (100 mL), followed by drying over sodium sulfate. The solution was concentrated and the residue was purified by flash column chromatography (PE:EtOAc=2:1) provides the title compound (101) (761 mg, 2.3 mmol, 35% yield) as a light yellow solid.

ESI-MS (M+1): 341 calc. for C₁₅H₂₁BrN₂O₂ 340.

Step 2. 3-phenyl-3′,4′,5′,6′-tetrahydro-2′H-[2,4′]bipyridinyl-1′-carboxylic acid tert-butyl ester (102)

To a stirred solution of 3-bromo-3′,4′,5′,6′-tetrahydro-2′H-[2,4′]bipyridinyl-1′-carboxylic acid tert-butyl ester (101) (163 mg, 0.48 mmol) in dioxane (10 mL) was added phenylboronic acid (78) (87 mg, 0.71 mmol), Na₂CO₃ (152 mg, 1.4 mmol) and H₂O (2 mL). The reaction mixture was degassed with N₂ and then PdCl₂(dppf) (35 mg, 0.05 mmol) was added. The reaction mixture was stirred at 80° C. for 12 h. The reaction mixture was left to reach RT and filtered through a pad of CELITE® and the filter cake was washed with CH₂Cl₂ (20 mL×3). The combined filtrates were evaporated in vacuo and the residue was purified by column chromatography ((EtOAc:Petrol ether=4:1) to give the desired compound (102) (138 mg, 0.41 mmol, 85% yield).

ESI-MS (M+1): 339 calc. for C₂₁H₂₆N₂O₂ 338.

Step 3. 3-phenyl-1′,2′,3′,4′,5′,6′-hexahydro-[2,4′]bipyridinyl hydrochloride (103)

A mixture of 3-phenyl-3′,4′,5′,6′-tetrahydro-2′H-[2,4′]bipyridinyl-1′-carboxylic acid tert-butyl ester (102) (202 mg, 0.60 mmol) in HCl/MeOH solution (5 mL) was stirred at RT. for 30 min. Then the solvent was evaporated at 40° C. to give 3-phenyl-1′,2′,3′,4′,5′,6′-hexahydro-[2,4′]bipyridinyl hydrochloride (103) (162 mg, 0.60 mmol, 100% yield) as a yellow solid.

ESI-MS (M+1): 239 calc. for C₁₆H₁₈N₂ 238.

Preparation 33

Step 1. 3-phenyl-N—O-tolyl-acrylamide (106)

A solution of o-tolylamine (104) (5.3 g, 50.0 mmol) in DCM (50 mL) was added to a stirring mixture of pyridine (5 mL) and DMAP (0.61 g, 5.0 mmol) in DCM (20 mL) at 0° C. under N₂. The mixture was stirred for 15 min before a solution of cinnamoyl chloride (105) (8.3 g, 50.0 mmol) in DCM (50 mL) was added over 10 min. After being stirred for further 15 min, the mixture was allowed to warm to RT. The precipitate formed was collected, washed with cold DCM and dried to afford the title compound (106) (9.9 g, 42.0 mmol, 84% yield).

Step 2. 8-methyl-1H-quinolin-2-one (107)

An intimate mixture of the 3-phenyl-n-o-tolyl-acrylamide (106) (5 g, 2.1 mmol) and aluminum chloride (0.83 g, 6.3 mmol) was heated rapidly to melting then heated at 100° C. for 1 h. After cooling to RT, iced water was added and the resultant precipitate was washed with water and 5% aqueous hydrochloric acid to give (107) (2.9 g, 1.8 mmol, 87% yield). ESI-MS (M+1): 160 calc. for C₁₀H₉NO 159.

Step 3. 2-chloro-8-methyl-quinoline (108)

A mixture of 8-methyl-1H-quinolin-2-one (107) (580 mg, 3.6 mmol) and phosphorus oxychloride (5 mL) was stirred at 60° C. overnight. The mixture was then poured onto ice water and extracted with DCM (3×50 mL). The combined extracts were washed with water (2×100 mL) and dried with Na₂SO₄, and the solvent was removed. The residue was chromatographed on silica gel using 5% to 20% EtOAc in petroleum ether to give product (108) as small colorless crystals (400 mg, 2.3 mmol, 63% yield).

The following Table 10 lists compounds of Preparation P33.1 to P33.12, which were made analogous to Preparation 33 by using the appropriate materials.

TABLE 10 PREPARATION P33.1 TO P33.12 Chemical ESI-MS Ex. # Structure Name (M + 1) P33.1

N-(o-tolyl) cinnamamide 238 P33.2

N-(4- fluorophenyl) cinnamamide 242 P33.3

N-(3- fluorophenyl) cinnamamide 242 P33.4

N-(2- chlorophenyl) cinnamamide 258 P33.5

8-Methyl-1H- quinolin-2-one 160 P33.6

6-Fluoro-1H- quinolin-2-one 164 P33.7

7-Fluoro-1H- quinolin-2-one 164 P33.8

8-Chloro-1H- quinolin-2-one 180 P33.9

2-chloro-8- methyl- quinoline 178 P33.10

2-chloro-6- fluoro- quinoline 182 P33.11

2-chloro-7- fluoro- quinoline 182 P33.12

2,8- dichloro- quinoline 198

Preparation 34

Step 1. 6-chloroquinazolin-2-amine (110)

A mixture of 5-chloro-2-fluoro-benzaldehyde (109) (5 g, 31.6 mmol) and guanidine carbonate (7.5 g, 41.1 mmol) was heated at 140° C. in DMA (50 mL) for 3 h. 100 ml water was added and after refrigeration, a solid was isolated by filtration, and dried under vacuum to give the product (110) (2.8 g, 15.8 mmol, 50% yield). ESI-MS (M+1): 180 calc. for C₈H₆ClN₃ 179.

Step 2. 2,6-dichloro-quinazoline (111)

To a suspension of 6-chloro-quinazolin-2-ylamine (110) (2.8 g, 15.8 mmol) and SbCl₃ (7.2 g, 32 mmol) in 1,2-dichloroethane (100 mL) was added tert-butylnitrate (6.2 ml, 52 mmol) and heated at 60° C. for 3 h under nitrogen atmosphere. To the mixture was added aqueous saturated NaHCO₃ and the mixture was filtered off and filtrate was extracted with CHCl₃. The organic layer was washed with brine, dried over Na₂SO₄, and evaporated. The residue was purified by silica gel column chromatography, using CHCl₃/EtOAc (9:1, v/v) as eluent to give 2,6-dichloro-quinazoline (111) (0.65 g, 3.12 mmol, 20% yield).

The following Table 11 lists compounds of Preparation P34.1 to P34.8, which were made analogous to Preparation 34 by using the appropriate materials.

TABLE 11 PREPARATION P34.1 TO P34.8 ESI-MS Ex. # Structure Chemical Name (M + 1) P34.1

6-chloroquinazolin- 2-amine 180 P34.2

8-chloroquinazolin- 2-amine 180 P34.3

7-chloroquinazolin- 2-amine 180 P34.4

5-chloroquinazolin- 2-amine 180 P34.5

2,6-dichloro- quinazoline 199 P34.6

2,8-dichloro- quinazoline 199 P34.7

2,7-dichloro- quinazoline 199 P34.8

2,5-dichloro- quinazoline 199

Preparation 35

2-chloro-1,6-naphthyridine (113)

A mixture of phosphoryl trichloride (5.17 ml, 56.5 mmol) and 1,6-naphthyridin-2(1H)-one (112) (1.65 g, 11.29 mmol, Alfa Aesar) was stirred at 70° C. for 16 h. The reaction mixture was cooled to RT and was poured onto 150 g of ice carefully. EtOAc (50 mL) was added and the mixture was treated carefully with about 30 mL of 5 M NaOH until the final pH is persistently >10. The mixture was vigorously mixed, then transferred into a separatory funnel. The EtOAc layer was then separated and dried and re-suspended in 30 mL of DCM, the insoluble solids were filtered off. The filtrate was loaded onto a silica gel pad and flushed with 30% EtOAc in hexanes to give a solid after drying. The solid was initially white but changed color to yellow after drying on the high vacuum line over night. Yield; 1.19 g, 64%. The material (113) was used directly in the next step without any further purification.

Preparation 36

(1H-benzoimidazol-2-yl)-[3-(3-chloro-pyrazin-2-yl)-azetidin-1-yl]-methanone (84)

A mixture of 1H-benzoimidazole-2-carboxylic acid (19) (100 mg, 0.47 mmol), 2-azetidin-3-yl-3-chloro-pyrazine hydrochloride (8) (96 mg, 0.47 mmol), HATU (540 mg, 1.3 mmol) and Et₃N (101 mg, 1 mmol) in dry DCM (10 mL) was stirred at RT overnight. Then the mixture reaction was poured into saturated aqueous Na₂CO₃ and extracted with DCM (50 mL×3), the organic layer was washed with brine, dried over Na₂SO₄ and concentrated to give the crude compound which was purified by ISCO silica gel column (10% to 80% EtOAc in petroleum ether) and followed by reverse phase prep. HPLC (10% to 80% water/MeCN) to afford pure (1H-benzoimidazol-2-yl)-[3-(3-chloro-pyrazin-2-yl)-azetidin-1-yl]-methanone (84) (50 mg, 0.16 mmol, yield 34%).

¹H-NMR (400 MHz, d₆-DMSO) δ (ppm) 8.67 (d, J=2.8 Hz, 1H); 8.43 (d, J=6.4 Hz, 1H); 7.63 (br, 2H); 7.25 (s, 2H); 5.10-5.08 (m, 1H); 4.97-4.93 (m, 1H); 4.51-4.39 (m, 3H).

ESI-MS (M+1): 314 calc. for C₁₅H₁₂ClN₅O 313.

The following Table 12 lists compound of Preparation P36.1, which was made analogous to Preparation 36 by using the appropriate materials.

TABLE 12 Chemical ESI-MS Ex. # Structure Name (M + 1) P36.1

(7-chloro- 1H-benzo[d] imidazol-2- yl)(3-(3- chloropyrazin- 2-yl) azetidin- 1-yl) methanone 348

Preparation 37

Step 1. 3-[3-(3,6-dihydro-2H-pyran-4-yl)-pyrazin-2-yl]-azetidine-1-carboxylic acid tert-butyl ester (115)

To a solution of 3-(3-chloro-pyrazin-2-yl)-azetidine-1-carboxylic acid tert-butyl ester (7) (1.0 g, 3.7 mmol) in dioxane (16 mL) was added a solution of Na₂CO₃ (780 mg, 6.4 mmol) in 5 mL water, followed by additional of 4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-3,6-dihydro-2H-pyran (114) (purchased from WUXI APPTEC) (840 mg 4.0 mmol) and Pd(dppf)Cl₂ (80 mg). The resulting mixture was heated to reflux overnight under N₂ atmosphere. TLC showed that the staring material was consumed completely. The solution was filtered and the filtrate was concentrated to give the residue which was purified by ISCO silica gel column (10% to 80% EtOAc in petroleum ether) to give the product 3-[3-(3,6-dihydro-2H-pyran-4-yl)-pyrazin-2-yl]-azetidine-1-carboxylic acid tert-butyl ester (115) (938 mg, 2.96 mmol, yield 80%) as solid. ESI-MS (M+1): 318 calc. for C₁₇H₂₃N₃O₃ 317.

Step 2: 3-[3-(tetrahydro-pyran-4-yl)-pyrazin-2-yl]-azetidine-1-carboxylic acid tert-butyl ester (116)

A mixture of (115) (938 mg, 2.96 mmol) and wet Pd—C (50%, 400 mg) in MeOH (30 mL) was stirred under H₂ (40 psi) at 30° C. overnight. Then the reaction mixture was filtered through CELITE® and washed with MeOH. The filtrate was concentrated to give the desired compound (116) (897 mg, 2.81 mmol, yield 95%). ESI-MS (M+1): 320 calc. for C₁₇H₂₅N₃O₃ 319.

Step 3. 2-azetidin-3-yl-3-(tetrahydro-pyran-4-yl)-pyrazine hydrochloride (117)

To a solution of 4 N HCl in MeOH (10 mL) was added 3-[3-(Tetrahydro-pyran-4-yl)-pyrazin-2-yl]-azetidine-1-carboxylic acid tert-butyl ester (116) (897 mg, 2.81 mmol) at 0° C. and the resulting mixture was stirred at RT for 1 h. The mixture was concentrated under reduced pressure to give 2-azetidin-3-yl-3-(tetrahydro-pyran-4-yl)-pyrazine hydrochloride (117) (716 mg, yield 100%) which was used for the next step without further purification. ESI-MS (M+1): 220 calc. for C₁₂H₁₇N₃O 219.

Preparation 38

Step 1. oxetan-3-ylidene-acetic acid ethyl ester (120)

To a solution of oxetan-3-one (118) (5 g, 69.4 mmol) in CH₂Cl₂ (50 mL) at 0° C. was added ethyl 2-triphenylphosphoranylideneacetate (119) (26.6 g, 76.3 mmol). The solution was allowed to warm to RT and stirred for 15 min. The reaction mixture was then filtered through a pad of silica (washing with 30 percent EtOAc:Petrol ether), and the solvent removed under reduced pressure to give ethyl 2-(oxetan-3-ylidene)acetate (120) as a colourless viscous oil (8.15 g, 57.4 mmol, yield: 79%). ESI-MS (M+1): 142 calc. for C₇H₁₀O₃ 142.

Step 2. 2-(3-ethoxycarbonyl-oxetan-3-yl)-malonic acid dimethyl ester (121)

To a solution of oxetan-3-ylidene-acetic acid ethyl ester (120) (5.0 g, 35.2 mmol) in DMF (30 mL) at RT was added sodium hydride (60% wt in mineral oil) (4.2 g, 106 mmol). The mixture was stirred at RT for 60 min and malonic acid dimethyl ester (4.7 g, 35.2 mmol) was added. The reaction mixture was stirred at RT for 4 h. Then the reaction mixture was neutralized with saturated NH₄Cl (10 mL), diluted with EtOAc (30 mL) and water (30 mL). The aqueous phase was extracted with EtOAc (3×80 mL) and the combined organic extracts were washed with brine (100 mL), dried over MgSO₄, filtered, and concentrated to give the product (121) (8.0 g, 30.8 mmol, yield: 87%). ESI-MS (M+1): 261 calc. for C₁₁H₁₆O₇ 260.

Step 3. (3-ethoxycarbonylmethyl-oxetan-3-yl)-acetic acid ethyl ester (122)

To a solution of 2-(3-Ethoxycarbonyl-oxetan-3-yl)-malonic acid dimethyl ester

(121) (5.0 g, 21.7 mmol) in DMSO (25 mL) was added NaCl (3.8 g, 65.1 mmol). The solution was heated at 160° C. for 3 h. The reaction mixture was diluted with EtOAc (30 mL) and water (30 mL). The aqueous phase was extracted with EtOAc (3×100 mL) and the combined organic extracts were washed with brine (100 mL), dried over MgSO₄, filtered, and concentrated to give the product (122) (2.3 g, 10 mmol, yield: 46° A). ESI-MS (M+1): 231 calc. for C₁₁H₁₈O₅ 230.

Step 4. 2-[3-(2-hydroxy-ethyl)-oxetan-3-yl]-ethanol (123)

(3-Ethoxycarbonylmethyl-oxetan-3-yl)-acetic acid ethyl ester (122) (2.3 g, 10 mmol) was dissolved in 20 ml of THF. This solution was cooled down to 0° C. using an ice bath and AlLiH₄ (1.1 g, 30 mmol) was added by portions. The reaction mixture was stirred for 4 h at ambient temperature, and then saturated aqueous solution of ammonium chloride (20 mL) was added. THF was evaporated off under reduced pressure, then the reaction mixture was taken up in ethyl acetate. The organic phase was separated from the aqueous phase. This extraction was repeated one more time and then the organic phases were combined and washed with brine (100 mL), dried over MgSO₄, filtered, and concentrated to give the product (123) (1.3 g, 8.9 mmol, yield: 89%). ESI-MS (M+1): 147 calc. for C₇H₁₄O₃ 146.

Step 5. methanesulfonic acid 2-[3-(2-methanesulfonyloxy-ethyl)-oxetan-3-yl]-ethyl ester (124)

To a solution of 2-[3-(2-Hydroxy-ethyl)-oxetan-3-yl]-ethanol (123) (1.3 g, 8.9 mmol) in CH₂Cl₂ (20 mL) at 0° C. was added Et₃N (2.7 g, 26.7 mmol) and methanesulfonyl chloride (2.0 g, 17.8 mmol). The solution was allowed to warm to RT and stirred for 15 min. The reaction mixture was diluted with water (80 mL). The aqueous phase was extracted with CH₂Cl₂ (3×50 mL) and the combined organic extracts were washed with brine (100 mL), dried over MgSO₄, filtered, and concentrated to give the product (124) (2.0 g, 6.6 mmol, yield: 74%). ESI-MS (M+1): 303 calc. for C₉H₁₈O₇S₂ 302.

Step 6. 7-(2,4-dimethoxy-benzyl)-2-oxa-7-aza-spiro[3.5]nonane (125)

To a solution of (124) (2.0 g, 6.6 mmol) in MeCN (20 mL) were added 2,4-dimethoxy-benzylamine (1.2 g, 7.3 mmol) and Et₃N (2.0 g, 19.8 mmol). The solution was allowed to heat at reflux for 12 h. The reaction mixture was then filtered through a pad of silica (washing with 30 percent EtOAc:Petrol ether), and the solvent removed under reduced pressure to give the product (125) (1.2 g, 4.3 mmol, yield: 65%). ESI-MS (M+1): 278 calc. for C₁₆H₂₃NO₃ 277.

Step 7. 2-oxa-7-aza-spiro[3.5]nonane (126)

To a solution of 7-(2,4-Dimethoxy-benzyl)-2-oxa-7-aza-spiro[3.5]nonane (125) (300 mg, 1.1 mmol) in MeOH (10 mL) was added Pd(OH)₂ (300 mg). The reaction solution was stirred at RT overnight under H₂ atmosphere. LCMS showed that most of the staring material was consumed. The mixture was filtered and concentrated to give the product (126) (112 mg, 0.88 mmol, yield: 80%). ESI-MS (M+1): 128 calc. for C₇H₁₃NO 127.

Preparation 39

Step 1. 6-ethyl-2-oxa-6-aza-spiro[3.3]heptanes (128)

To a solution of 3-bromo-2,2-bis(bromomethyl)propanol (127) (3.25 g, 10 mmol) and potassium hydroxide (1.12 g, 20 mmol, in 10 mL water) in EtOH (20 mL) were added toluene-4-sulfonamide (3.76 g, 22 mmol). The reaction mixture was refluxed for 2 h, evaporated to remove EtOH then diluted with EAOAc (20 mL), washed with H₂O (20 mL). The organic layer was washed with brine (20 mL), dried over Na₂SO₄, and filtered, evaporated to give the product to give 6-(toluene-4-sulfonyl)-2-oxa-6-aza-spiro[3.3]heptane (128) (1.6 g, 6.3 mmol, yield: 63%).

ESI-MS (M+1): 128 calc. for C₇H₁₃NO 127.

Step 2. 2-oxa-6-aza-spiro[3.3]heptane oxalate salt (129)

A mixture of 6-(toluene-4-sulfonyl)-2-oxa-6-aza-spiro[3.3]heptane (128) (1.27 g, 5 mmol) in MeOH (10 mL) was added magnesium chips. The mixture was reacted using ultrasound at RT for 20 mins. Oxalic acid was added and the mixture was stirred for 15 min, then concentrated to give oxalate salt (129) (1.06 g, 3.68 mmol, yield: 73.6%).

¹H NMR: (D₂O, 400 MHz): δ (ppm) 4.76 (s, 4H), 4.23 (s, 4H). ESI-MS (M+1): 101 calc. for C₅H₉NO 100.

Preparation 40

Step 1. 6-acetyl-2,6-diaza-spiro[3.3]heptane-2-carboxylic acid tert-butyl ester (131)

To a solution of 2,6-diaza-spiro[3.3]heptane-2-carboxylic acid tert-butyl ester (130) (purchased from WUXI APPTEC®) ((500 mg, 2.73 mmol) in CH₂Cl₂ (10 mL) were added KOH (459 mg, 8.19 mmol) and Ac₂O (279 mg, 2.73 mmol). The reaction mixture was stirred at RT for 1 h, then diluted with CH₂Cl₂ (20 mL), washed with H₂O (20 mL). The organic layer was washed with brine (20 mL), dried over Na₂SO₄, and filtered, evaporated to give the product (131) (510 mg, 2.13 mmol, yield: 78%). ESI-MS (M+1): 241 calc. for C₁₂H₂₀N₂O₃ 240.

Step 2. 1-(2,6-diaza-spiro[3.3]hept-2-yl)-ethanone hydrochloride (132)

To a solution of 6-Acetyl-2,6-diaza-spiro[3.3]heptane-2-carboxylic acid tert-butyl ester (131) (300 mg, 1.33 mmol) in CH₂Cl₂ (10 mL) were added TFA (388 mg, 4.0 mmol). The reaction mixture was stirred at RT for 1 h, then diluted with CH₂Cl₂ (20 mL), washed with H₂O (20 mL). The organic layer was washed with brine (20 mL), dried over Na₂SO₄, and filtered, evaporated to give the product (132) (176 mg, 1.0 mmol, yield: 75%). ESI-MS (M+1): 141 calc. for C₇H₁₂N₂O 140.

Preparation 41

Step 1. 2,2-dimethyl-3,6-dihydro-2H-pyran-4-yl trifluoromethanesulfonate and 6,6-dimethyl-3,6-dihydro-2H-pyran-4-yl trifluoromethanesulfonate (134)

A solution of 2,2-dimethyltetrahydropyran-4-one (133) (115 g, 0.9 mol, 1.0 eq.) in anhydrous THF (600 mL) was cooled to −78° C. and to it was added LDA (2.0 M, 538 mL, 1.08 mol, 1.2 eq.) drop wise under N₂ keeping the internal temperature below −65° C. The resulting solution was stirred at −78° C. for 20 min. A solution of N-phenyl-bis(trifluoromethanesulfonimide) (353 g, 0.99 mol, 1.1 eq.) in anhydrous THF (1900 mL) was added to the above solution slowly keeping the internal temperature below −65° C. The reaction mixture was warmed to room temperature slowly and stirred overnight. The reaction was quenched with saturated aqueous sodium bicarbonate solution, and extracted with MTBE (2 L×2). The combined organic layers was washed with 10% aqueous NaOH solution (1 L×2), brine (500 mL×2), dried over Na₂SO₄, filtered and concentrated to give crude title triflate product mixture as dark brown oil. The crude product was extracted with hexanes (2 L×5) and the combined hexanes extracts was purified by column chromatography (directly loaded onto silica gel, Hexanes→15% ethyl acetate in hexanes, R_(f)=0.6, visualized with KMnO₄ stain) to give 200 g of the triflate product mixture (134) (a mixture of 2,2-dimethyl-3,6-dihydro-2H-pyran-4-yl trifluoromethanesulfonate and 6,6-dimethyl-3,6-dihydro-2H-pyran-4-yl trifluoromethanesulfonate ratio=80.6:19.4 by GCMS) as a light yellow liquid (˜90% purity by GC-MS and ¹H NMR). This was taken to the next step without further purification.

Step 2. 2-(2,2-dimethyl-3,6-dihydro-2H-pyran-4-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane and 2-(6,6-dimethyl-3,6-dihydro-2H-pyran-4-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (136)

A mixture of compound 2,2-dimethyl-3,6-dihydro-2H-pyran-4-yl trifluoromethanesulfonate and 6,6-dimethyl-3,6-dihydro-2H-pyran-4-yl trifluoromethanesulfonate (134) (200 g, 0.77 mol, 1.0 eq.), bis(pinacolato)diboron (135) (195 g, 0.77 mol, 1.0 eq.), and potassium acetate (151 g, 1.54 mol, 2.0 eq.) in dioxane (2 L) was degassed for 15 min, to it was added 1,1′-bis(diphenylphosphino)ferrocene-palladium(II) dichloride dichloromethane complex (19 g, 0.023 mol, 0.03 eq.) and the reaction mixture was degassed again for 15 min. The reaction mixture was heated to 80° C. overnight, cooled, filtered through a medium fritted funnel, and washed with MTBE (300 mL×4). The organic extracts were combined and concentrated under reduced pressure. The crude product mixture (136) was cooled using an ice bath, stirred with an overhead stirrer and to it was added aqueous 2M NaOH solution (2 L) keeping the internal temperature below 15° C. The basic aqueous solution was extracted with MTBE (250 mL×3), and the organic extracts were discarded. The aqueous phase was cooled using an ice bath and the pH was adjusted to 3 to 5 with concentrated HCl keeping the internal temperature below 10° C. The heterogeneous solution (off-white solid precipitated out at pH 3-5) was extracted with EtOAc (3 L and 1.5 L). The combined organic layer was washed with water (1 L), brine (1 L), dried over Na₂SO₄, filtered and concentrated. The crude product mixture (136) was purified by column chromatography (Hexanes→>15% ethyl acetate in hexanes, R_(f)=0.5, visualized on KMnO₄) to give 125 g of 2-(2,2-dimethyl-3,6-dihydro-2H-pyran-4-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane and 2-(6,6-dimethyl-3,6-dihydro-2H-pyran-4-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane mixture (136) as a white solid (58% overall yield, >97% purity by GCMS and ¹H NMR, The ratio of regioisomers was found to be 80.4:19.6).

GCMS: >97%

¹H NMR (300 MHz, CDCl₃) δ 6.46-6.43 (m, 1H), 4.06 (q, 2H, J=3.0 Hz), 1.96-1.94 (m, 2H), 1.20 (s, 12H), 1.09 (s, 6H)

GCMS: 239 (M+1); calcd for C₁₃H₂₃BO₃: 238.13

Example 1.1 (1H-benzoimidazol-2-yl)-[3-(3-phenyl-pyridin-2-yl)-azetidin-1-yl]-methanone

To a mixture of 1H-benzoimidazole-2-carboxylic acid (124 mg, 0.76 mmol) in DMF (5 mL) was added TEA (152 mg, 1.5 mmol) and HATU (347 mg, 0.92 mmol). The reaction mixture was stirred for 5 min and 2-azetidin-3-yl-3-phenyl-pyridine hydrochloride (100 mg, 0.76 mmol) was added. The reaction mixture was stirred at RT overnight. The mixture was diluted with water (10 mL), and extracted with EtOAc (2×20 mL). The combined organic extracts were washed with water (5 mL) and brine (5 mL), dried over Na₂SO₄, and filtered. The filtrate was evaporated in vacuo and the residue was purified by column chromatography to give (1H-benzoimidazol-2-yl)-[3-(3-phenyl-pyridin-2-yl)-azetidin-1-yl]-methanone (100 mg, 0.28 mmol, 59% yield) as a light yellow solid.

The following Table 13A lists compounds of Examples 1.1 to 1.17, which were made analogous to Scheme 1 by using the appropriate materials and reaction conditions, which are listed in Table 13B. The NMR of the Examples are listed in Table 13C.

TABLE 13A EXAMPLES 1.1 TO 1.17 ESI-MS IC₅₀ Ex. # Structure Chemical Name (M + 1) (uM) 1.1

(1H-Benzoimidazol-2-yl)-[3- (3-phenyl-pyridin-2-yl)- azetidin-1-yl]-methanone 355 0.0219 1.2

(1H-Benzoimidazol-2-yl)-[3- (5-fluoro-3-phenyl-pyridin- 2-yl)-azetidin-1-yl]- methanone 373 0.843  1.3

(1H-benzoimidazol-2-yl)-[4- (3-phenyl-pyrazin-2-yl)- piperidin-1-yl]-methanone 384 0.092  1.4

Benzothiazol-2-yl-[3-(3- phenyl-pyrazin-2-yl)- azetidin-1-yl]-methanone 373 0.446  1.5

(1H-Benzoimidazol-2-yl)-[3- (3-piperidin-1-yl-quinoxalin- 2-yl)-azetidin-1-yl]- methanone 413 0.0271 1.6

(1H-Benzoimidazol-2-yl)- {3-[3-(4-hydroxy-piperidin- 1-yl)-quinoxalin-2-yl]- azetidin-1-yl}-methanone 429 0.0115 1.7

(1H-Benzoimidazol-2-yl)-[3- (2,3-dihydro-indol-1-yl)- 3′,4′,5′,6′-tetrahydro-2′H- [2,4′]bipyridinyl-1′-yl]- methanone 424 0.92 1.8

(1H-Benzoimidazol-2-yl)-[3- (3-phenyl-quinolin-2-yl)- azetidin-1-yl]-methanone 405 0.0834 1.9

(1H-Benzoimidazol-2-yl)-(3- phenyl-3′,4′,5′,6′-tetrahydro- 2′H-[2,4′]bipyridinyl-1′-yl)- methanone 383 0.0217 1.10

(1H-Benzoimidazol-2-yl)- {4-[3-(4-hydroxymethyl- piperidin-1-yl)-pyrazin-2- yl]-piperidin-1-yl}- methanone 421 0.0098 1.11

(3-(3-phenylpyrazin-2- yl)azetidin-1-yl)(pyridin-2- yl)methanone 317 0.828  1.12

(6-methylpyridin-2-yl)-(3-(3- phenylpyrazin-2-yl)azetidin- 1-yl)methanone 331 3.67  1.13

(3-methylpyridin-2-yl)(3-(3- phenylpyrazin-2-yl)azetidin- 1-yl)methanone 331 11.9   1.14

(5-methylpyridin-2-yl)(3-(3- phenylpyrazin-2-yl)azetidin- 1-yl)methanone 331 2.03  1.15

(4-methylpyridin-2-yl)(3-(3- phenylpyrazin-2-yl)azetidin- 1-yl)methanone 331 4.71  1.16

(1H-Benzoimidazol-2-yl)-[3- (3-phenyl-quinoxalin-2-yl)- azetidin-1-yl]-methanone 406 0.0335 1.17

(1H-Benzoimidazol-2-yl)-[3- (3-morpholin-4-yl-pyrazin-2- yl)-azetidin-1-yl]-methanone 365 0.14 

TABLE 13B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 1.1 TO 1.17 Ex. # Starting Material 1 Starting Material 2 Reaction Condition 1.1

HATU, TEA, DMF 1.2

HATU, TEA, DMF 1.3

HATU, TEA, DMF 1.4

HATU, TEA, DMF 1.5

HATU, TEA, DMF 1.6

HATU, TEA, DMF 1.7

HATU, TEA, DMF 1.8

HATU, TEA, DMF 1.9

HATU, TEA, DMF 1.10

HATU, TEA, DMF 1.11

HATU, TEA, DMF 1.12

HATU, TEA, THF 1.13

HATU, TEA, THF 1.14

HATU, TEA, THF 1.15

HATU, TEA, THF 1.16

HATU, TEA, DMF 1.17

HATU, TEA, DCM

TABLE 13C 1H NMR δ (PPM) DATA FOR EXAMPLES 1.1 TO 1.17 Ex. # Structure NMR 1.1

(DMSO, 400 MHz): 8.61 (s, 1 H); 7.72-7.70 (m, 2 H); 7.66-7.20 (m, 10 H); 4.88-4.86 (m, 2 H); 4.20- 4.13 (m, 3 H). 1.2

(CDCl₃, 400 MHz): 8.49 (d, J = 2.4 Hz, 1H); 8.13- 8.10 (m, 1H); 7.67-7.66 (m, 2H); 7.55-7.50 (m, 3H); 7.45-7.43 (m, 2H); 7.37-7.35 (m, 2H); 4.99- 4.95 (m, 1H); 4.78-4.74 (m, 1H); 4.39-4.37 (m, 1 H); 3.34-4.25 (m, 1H); 4.17-4.13 (m, 1H). 1.3

(CDCl₃, 400 MHz): 8.50 (s, 2H); 7.70-7.67 (m, 2H); 7.56-7.51 (m, 5H); 7.37-7.26 (m, 2H); 6.06- 6.03 (m, 1H); 4.91-4.88 (m, 1H); 3.39-3.28 (m, 2H); 2.90-2.84 (m, 1H); 2.17-2.11 (m, 2H); 2.01- 1.90 (m, 2H). 1.4

(CDCl₃, 400 MHz): 8.60 (dd, J = 2.4, 17.2 Hz, 2H); 8.06 (d, J = 7.6 Hz, 1H); 7.96 (d, J = 7.2 Hz, 1H); 7.56-7.45 (m, 7H); 5.15-5.06 (m, 2H); 4.53- 4.42 (m, 2H); 4.39-4.32 (m, 1H). 1.5

(DMSO, 400 MHz): 7.93-7.91 (m, 1H); 7.77-7.70 (m, 2H); 7.63-7.61 (m, 1H); 7.55-7.49 (m, 2H); 7.28-7.22 (m, 2H); 5.13-5.11 (m, 1H); 5.01-5.00 (m, 1H); 4.54-4.53 (m, 1H); 4.42-4.40 (m, 2H); 3.18-3.16 (m, 4H); 1.71-1.68 (m, 4H); 1.61-1.59 (m, 2H). 1.6

(DMSO, 400 MHz): 7.92 (d, J = 7.6 Hz, 1H); 7.77- 7.71 (m, 2H); 7.65-7.63 (m, 1H); 7.55-7.50 (m, 2H); 7.30-7.20 (m, 2H); 5.13-5.10 (m, 1H); 4.73 (d, J = 4.0 Hz, 1H); 4.54-4.48 (m, 1H); 4.46-4.41 (m, 2H); 3.70-3.69 (m, 3H); 3.49-3.44 (m, 2H); 2.99-2.95 (m, 2H); 1.95-1.91 (m, 2H); 1.63-1.58 (m, 2H). 1.7

(CDCl₃, 400 MHz): 8.53 (d, J = 4.8 Hz, 1H); 8.30 (d, J = 8.4, 1H); 7.78-7.68 (m, 3H); 7.52-7.45 (m, 2H); 7.37-7.31 (m, 1H); 7.10-7.03 (m, 1H); 6.91- 6.87 (m, 1H); 6.34 (d, J = 7.6 Hz, 1H); 4.89-4.86 (m, 1H); 4.30-4.27 (m, 1H); 3.82-3.73 (m, 3H); 3.50-3.38 (m, 1H); 3.34-3.25 (m, 2H); 2.95-2.89 (m, 1H); 2.53-2.43 (m, 1H); 2.33-2.29 (m, 1H); 1.96-1.94 (m, 1H); 1.89-1.85 (m, 1H). 1.8

(DMSO, 400 MHz): 8.22 (s, 1); 8.06 (d, J = 8.8 Hz, 1H); 7.99 (d, J = 8.0 Hz, 1H); 7.74-7.69 (m, 2H); 7.60-7.45 (m, 8H); 7.27-7.21 (m, 2H); 5.08- 5.06 (m, 1H); 4.88-4.86 (m, 1H); 4.35-4.33 (m, 2H); 4.14-4.13 (m, 1H). 1.9

(CD₃OD, 400 MHz): 8.73-8.71 (m, 1H); 8.35-8.33 (m, 1H); 7.91-7.88 (m, 1H); 7.68-7.88 (m, 1H); 7.58-7.54 (m, 3H); 7.45-7.43 (m, 2H); 7.40-7.37 (m, 2H); 5.07-5.02 (m, 1H); 4.80-4.71 (m, 1H); 3.48-3.45 (m, 1H); 3.28-3.25 (m, 1H); 2.90-2.80 (m, 1H); 2.15-2.00 (m, 4H). 1.10

(CD₃OD, 400 MHz): 8.14-8.12 (m, 1H); 8.10-8.08 (m, 1H); 7.76-7.74 (m, 2H); 7.50-7.48 (m, 2H); 4.35 (d, J = 6.8 Hz, 1H); 3.50 (d, J = 6.4 Hz, 2H); 3.46-3.43 (m, 4H); 3.31-3.30 (m, 2H); 3.15 (s, 1H); 2.92-2.89 (m, 2H); 1.99-1.98 (m, 3H); 1.89 (d, J = 12.8 Hz, 3H); 1.71-1.48 (m, 2H). 1.11

(CD₃OD, 400 MHz): 8.65 (d, J = 2.4 Hz, 1H), 8.53 (d, J = 2.4 Hz, 2H), 7.98-7.89 (m, 2H), 7.52-7.47 (m, 6H), 4.90-4.86 (m, 2H), 4.39-4.26 (m, 3H). 1.12

(CD₃OD, 400 MHz): 8.64 (d, J = 2.4 Hz, 1H), 8.53 (d, J = 2.8 Hz, 1H), 7.91-7.87 (m, 1H), 7.80 (d, J = 8 Hz, 1H), 7.51-7.46 (m, 6H), 4.85-4.83 (m, 2H), 4.37-4.31 (m, 3H), 2.54 (s, 3H). 1.13

(CD₃OD, 400 MHz): 8.53 (d, J = 2.4 Hz, 1H), 8.42 (d, J = 4.8 Hz, 1H), 8.40 (s, 1H), 7.91-7.89 (m, 1H), 7.51-7.43 (m, 6H), 4.39-4.29 (m, 5H), 2.45 (s, 3H). 1.14

(CD₃OD, 400 MHz): 8.63 (d, J = 2.4 Hz, 1H), 8.52 (d, J = 2.8 Hz, 1H), 8.41 (s, 1H), 7.87 (d, J = 8.4 Hz, 1H), 7.76-7.73 (m, 1H), 7.50-7.46 (m, 5H), 4.85-4.84 (m, 2H), 4.37-4.26 (m, 3H), 2.36 (s, 3H). 1.15

(CD₃OD, 400 MHz): 9.48 (d, J = 2.4 Hz, 1H), 9.42 (d, J = 2.8 Hz, 1H), 9.22 (d, J = 5.2 Hz, 1H), 8.58- 8.57 (m, 1H), 8.31 (s, 5H), 8.14-8.12 (m, 1H), 5.61-5.52 (m, 2H), 5.04-4.97 (m, 3H), 3.15 (s, 3H). 1.16

(d-DMSO, 400 MHz): 8.17-8.11 (m, 2H); 7.86-7.85 (m, 2H); 7.67-7.48 (m, 7H); 7.27-7.26 (m, 2H); 5.11-5.07 (m, 1H); 4.98-4.94 (m, 1H); 45.1-4.49 (m, 1H); 4.39-4.35 (m, 1H); 4.27-4.22 (m, 1H). 1.17

(CDCl₃, 400 MHz): 8.23-8.22 (m, 1H); 8.16-8.15 (m, 1H); 7.17-7.69 (m, 2H); 7.36-7.34 (m, 2H); 5.33 (t, J = 10.0 Hz, 1H); 5.10-5.06 (m, 1H); 4.65- 4.59 (m, 2H); 4.35-4.25 (m, 1H); 3.88-3.89 (m, 4H); 3.17-3.14 (m, 4H)

Example 2.1 (1-methyl-1H-benzoimidazol-2-yl)-[3-(3-phenyl-pyrazin-2-yl)-azetidin-1-yl]-methanone

To a stirred solution of [3-(3-chloro-pyrazin-2-yl)-azetidin-1-yl]-(1-methyl-1H-benzoimidazol-2-yl)-methanone (100 mg, 0.30 mmol) in dioxane (10 mL) was added phenylboronic acid (87 mg, 0.71 mmol), Na₂CO₃ (152 mg, 1.4 mmol) and H₂O (2 mL). The reaction mixture was degassed with N₂ and then PdCl₂(dppf) (35 mg, 0.05 mmol) was added. The reaction mixture was stirred at 80° C. for 12 h. The reaction mixture was left to reach RT and filtered through a pad of CELITE® and the filter cake was washed with CH₂Cl₂ (20 mL×3). The combined filtrates were evaporated in vacuo and the residue was purified by column chromatography to give the desired compound (60 mg, 0.17 mmol, yield 70%)

The following Table 14A lists compounds of Examples 2.1 to 2.30, which were made analogous to Scheme 2 by using the appropriate materials and reaction conditions, which are listed in Table 14B. The NMR data of the Examples are listed in Table 14C.

TABLE 14A EXAMPLES 2.1 TO 2.30 ESI-MS IC₅₀ Ex. # Structure Chemical Name (M + 1) (uM) 2.1

(1-Methyl-1H-benzoimidazol-2- yl)-[3-(3-phenyl-pyrazin-2-yl)- azetidin-1-yl]-methanone 370 0.181  2.2

[3-(3-Phenyl-pyrazin-2-yl)- azetidin-1-yl]-[1-(2,2,2-trifluoro- ethyl)-1H-benzoimidazol-2-yl]- methanone 438 0.893  2.3

(1H-Benzoimidazol-2-yl)-[3-(3- phenyl-pyrazin-2-yl)-azetidin-1- yl]-methanone 356 0.0248 2.4

(1H-Benzoimidazol-2-yl)-{3-[3- (3,4-dimethoxy-phenyl)-pyrazin-2- yl]-azetidin-1-yl}-methanone 416 0.0188 2.5

(1H-Benzoimidazol-2-yl)-{3-[3- (3-isopropyl-phenyl)-pyrazin-2- yl]-azetidin-1-yl}-methanone 398 0.049  2.6

(1H-Benzoimidazol-2-yl)-{3-[3- (3-trifluoromethoxy-phenyl)- pyrazin-2-yl]-azetidin-1-yl}- methanone 440 0.0357 2.7

1H-Benzoimidazol-2-yl)-{3-[3- (3,5-dimethoxy-phenyl)-pyrazin-2- yl]-azetidin-1-yl}-methanone 416 0.056  2.8

(1H-Benzoimidazol-2-yl)-{3-[3- (3-ethoxy-phenyl)-pyrazin-2-yl]- azetidin-1-yl}-methanone 400 0.0299 2.9

(1H-Benzoimidazol-2-yl)-{3-[3- (3-isopropyl-phenyl)-pyrazin-2- yl]-azetidin-1-yl}-methanone 414 0.0352 2.10

(1H-Benzoimidazol-2-yl)-{3-[3- (3-fluoro-5-methoxy-phenyl)- pyrazin-2-yl]-azetidin-1-yl}- methanone 404 0.424 2.11

(1H-Benzoimidazol-2-yl)-{3-[3- (2-methoxy-pyridin-4-yl)-pyrazin- 2-yl]-azetidin-1-yl}-methanone 387 0.093 2.12

(1H-Benzoimidazol-2-yl)-{3-[3- (5-methoxy-pyridin-3-yl)-pyrazin- 2-yl]-azetidin-1-yl}-methanone 387 0.640 2.13

(1H-Benzoimidazol-2-yl)(3-(3- (4-fluoro-3-methylphenyl)pyrazin- 2-yl)azetidin-1-yl)methanone 388 0.013  2.14

(1H-Benzoimidazol-2-yl)-{3-[3- (4-methoxy-3-methyl-phenyl)- pyrazin-2-yl]-azetidin-1-yl}- methanone 400 0.0201 2.15

(1H-Benzoimidazol-2-yl)-{3-[3- (3-fluoro-5-methyl-phenyl)- pyrazin-2-yl]-azetidin-1-yl}- methanone 388 0.0393 2.16

(1H-Benzoimidazol-2-yl)-{3-[3- (5-methyl-pyridin-3-yl)-pyrazin-2- yl]-azetidin-1-yl}-methanone 371 0.195  2.17

(1H-Benzoimidazol-2-yl)-{3-[3- (4-methyl-thiophen-2-yl)-pyrazin- 2-yl]-azetidin-1-yl}-methanone 376 0.013  2.18

(1H-Benzoimidazol-2-yl)-{3-[3- (1-methyl-1H-pyrazol-4-yl)- pyrazin-2-yl]-azetidin-1-yl}- methanone 360 0.216 2.19

(1H-Benzoimidazol-2-yl)-{3-[3- (3-hydroxymethyl-phenyl)- pyrazin-2-yl]-azetidin-1-yl}- methanone 386 0.0336 2.20

(1H-Benzoimidazol-2-yl)-{3-[3- (4-hydroxymethyl-phenyl)- pyrazin-2-yl]-azetidin-1-yl}- methanone 386 0.0398 2.21

1-(4-{3-[1-(1H-Benzoimidazole-2- carbonyl)-azetidin-3-yl]-pyrazin-2- yl}-phenyl)-ethanone 398 0.0247 2.22

1-(3-{3-[1-(1H-Benzoimidazole-2- carbonyl)-azetidin-3-yl]-pyrazin-2- yl}-phenyl)-ethanone 398 0.0151 2.23

(1H-Benzoimidazol-2-yl)-{3-[3- (3-methoxymethyl-phenyl)- pyrazin-2-yl]-azetidin-1-yl}- methanone 400 0.0449 2.24

4-{3-[1-(1H-Benzoimidazole-2- carbonyl)-azetidin-3-yl]-pyrazin-2- yl}-N,N-dimethyl-benzamide 427 0.026 2.25

3-{3-[1-(1H-Benzoimidazole-2- carbonyl)-azetidin-3-yl]-pyrazin-2- yl}-N,N-dimethyl-benzamide 427 0.537 2.26

(1H-benzo[d]imidazol-2-yl)(3-(3- (pyridin-4-yl)pyrazin-2- yl)azetidin-1-yl)methanone 357 0.25 2.27

(7-chloro-1H-benzo[d]imidazol-2- yl)(3-(3-(pyridin-3-yl)pyrazin-2- yl)azetidin-1-yl)methanone 391 0.587 2.28

(1H-benzo[d]imidazol-2-yl)(3-(3- (2-methylpyridin-4-yl)pyrazin-2- yl)azetidin-1-yl)methanone 371 0.037 2.29

(1H-benzo[d]imidazol-2-yl)(3-(3- (m-tolyl)pyrazin-2-yl)azetidin-1- yl)methanone 370 0.0148 2.30

3-(3-(1-(1H-benzo[d]imidazole-2- carbonyl)azetidin-3-yl)pyrazin-2- yl)benzonitrile 381 0.226

TABLE 14B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 2.1 TO 2.30 Ex. # Structure NMR 2.1

(CD₃OD, 400 MHz): 8.65(d, J = 2.4 Hz, 1 H); 8.53(d, J = 2.4, 1 H); 7.70-7.67(m, 1 H); 7.59-7.58(m, 1 H); 7.53-7.40(m, 5 H); 7.38-7.35(m, 1 H); 7.34-7.31(m, 1 H); 4.81-4.80(m, 2 H); 4.41-4.32(m, 1 H); 4.07(s, 3 H). 2.2

(CD₃OD, 400 MHz): 8.67-8.66(m, 1 H); 8.53-8.52(m, 1 H); 7.74-7.72(m, 1 H); 7.63-7.61(m, 1 H); 7.53-7.48 (m, 5 H); 7.45-7.41(m, 1 H); 7.37-7.33(m, 1 H); 5.60- 5.56(m, 2 H); 4.94-4.92(m, 2 H); 4.41-4.34(m, 3 H). 2.3

(CDCl₃, 400 MHz): 8.62-8.60(m, 2 H); 7.69-7.68(m, 2H); 7.57-7.44(m, 5H); 7.43-7.32(m, 2H); 5.22-5.12 (m, 2H); 4.64-4.62(m, 1H); 4.52-4.34(m, 1H). 2.4

(CDCl₃, 400 MHz): 8.51-8.48(m, 2 H); 7.72(br, 1H); 7.47(br, 1H); 7.24(brs, 2H); 7.05(s, 1 H); 6.93(s, 2 H); 5.15-5.16(m, 2H); 4.58-4.54(m, 1 H); 4.46-4.44(m, 1H); 4.38-4.30(m, 1 H); 3.90(s, 6 H) 2.5

(CDCl₃, 400 MHz): 8.60-8.57(m, 2 H); 7.67(brs, 2H); 7.46-7.44(m, 1H); 7.38-7.37(m, 2 H); 7.31-7.26(m, 3 H); 5.17-5.16(m, 2H); 4.63-4.62(m, 1H); 4.51-4.50(m, 1 H); 4.36-4.33(m, 1 H); 3.05-2.99(m, 2H); 1.33(d, J = 6.8 Hz, 6H). 2.6

(DMSO, 400 MHz): 8.75-8.74(m, 1 H); 8.67-8.66(m, 1H); 7.69-7.54(m, 6H); 7.27-7.25(m, 2H); 4.95-4.92 (m, 2H); 4.31-4.25(m, 3H). 2.7

(CDCl₃, 400 MHz): 8.60(d, J = 2.4 Hz, 1H); 8.56(d, J = 2.4 Hz, 1H); 7.67(br, 2H); 7.43-7.40(m, 1H); 7.32- 7.30(m, 2H); 7.02-6.98(m, 3H); 5.17-5.16(m, 2H); 4.66-4.60(m, 2H); 4.54-4.49(m, 1H); 4.40-4.36(m, 1H); 1.38(d, J = 6.0 Hz, 6H). 2.8

(CDCl₃, 400 MHz): 8.63-8.59(m, 2 H); 7.70(br, 2 H); 7.44-7.28(m, 3 H); 7.06-7.01(m, 3 H); 5.20-5.18(m, 2 H); 4.63-4.53(m, 2 H); 4.41-4.40(m, 1 H); 4.15-4.10 (m, 2 H); 1.49-1.45(m, 3 H). 2.9

(DMSO, 400 MHz): 8.70(d, J = 2.4 Hz, 1H); 8.64(d, J = 2.4 Hz, 1 H); 7.71(brs, 1H); 7.50-7.41(m, 5 H); 7.26 (brs, 2H); 5.32-5.29(m, 1 H); 4.98-4.93(m, 2H); 4.61- 4.59(m, 2 H); 4.34-4.28(m, 2H); 4.24-4.21(m, 1H). 2.10

(CDCl₃, 400 MHz): 8.62(d, J = 2.4 Hz, 1H); 8.57(d, J = 2.4 Hz, 1H); 7.69-7.67(m, 2H); 7.34-7.32(m, 2H); 7.26-7.15(m, 2H); 6.96-6.92(m, 1H); 5.19-5.14(m, 2H); 4.62(t, J = 6.0 Hz, 1H); 4.51(t, J = 9.2 Hz, 1H); 4.37-4.34(m, 1H); 3.97(s, 3H) 2.11

(CDCl₃, 400 MHz): 8.70-8.69(m, 1H); 8.63-8.62(m, 1 H); 8.43-8.42(m, 1 H); 7.74-7.72(m, 2 H); 7.43-7.41 (m, 2H); 7.12-7.11(m, 1 H); 7.01(s, 1 H); 5.15-5.11(m, 2 H); 4.56-4.52(m, 2 H); 4.32-4.31(m, 1 H); 4.06(s, 3 H). 2.12

(CDCl₃, 400 MHz): 8.66-8.65(m, 1H); 8.57-8.56(m, 2H); 8.50(s, 1H); 7.96(s, 1H); 7.66-7.64(m, 2H); 7.36- 7.34(m, 2H); 5.09-5.00(m, 2H); 4.59-4.46(m, 2H); 4.29-4.27(m, 1H); 4.00(s, 3H) 2.13

(CDCl₃, 400 MHz): 8.54(d, J = 1.6 Hz, 1H); 8.49(d, J = 2.4 Hz, 1H); 7.62(s, 2H); 7.33-7.26(m, 3H); 7.19(s, 1H); 7.09(t, J = 8.8 Hz, 1H); 5.13-5.10(m, 2H); 4.29- 4.18(m, 1H); 2.62(s, 3H). 2.14

(CDCl₃, 400 MHz): 8.56(s, 2H); 7.69(brs, 2H); 7.34- 7.24(m, 4 H); 6.96-6.94(m, 1H); 5.21-5.15(m, 2H); 4.60-4.40(m, 3H); 3.90(s, 3H); 2.30(s, 3H). 2.15

(CDCl₃, 400 MHz): 8.62-8.57(m, 2H); 7.67-7.67(m, 2H); 7.30(brs, 2 H); 7.05-7.03(m, 3 H); 5.17-5.15(m, 2H); 4.62-4.48(m, 2H); 4.35-4.33(m, 1 H); 2.46(s, 3 H). 2.16

(CDCl₃, 400 MHz): 8.83(s, 1H); 8.67(s, 1H); 8.65(d, J = 2.0 Hz, 1H); 8.56(d, J = 2.0 Hz, 1H); 8.31(s, 1H); 7.65-7.62(m, 2H); 7.33-7.31(m, 2H); 5.11-5.07(m, 1H); 5.03-5.00(m, 1H); 4.29-4.25(m, 1H); 2.57(s, 3H). 2.17

(CDCl₃, 400 MHz): 8.58-8.54(m, 2 H); 7.61(br, 2 H); 7.40-7.38(m, 2 H); 7.27-7.25(m, 2 H); 5.15-5.13(m, 1 H); 4.96-4.92(m, 1 H); 4.58-4.53(m, 2 H); 4.38-4.36 (m, 1H); 2.29(s, 3H). 2.18

(CDCl₃, 400 MHz): 8.50-8.49(m, 2 H); 7.87(brs, 2H); 7.72(br, 2 H); 7.41-7.40(m, 2H); 5.30-5.29(m, 1H); 5.08-5.07(m, 1 H); 4.65-4.61(m, 2H); 4.49-4.48(m, 1H); 4.03(s, 3H). 2.19

(DMSO, 400 MHz): 8.70(d, J = 2.4 Hz, 1H); 8.64(d, J = 2.4 Hz, 1H); 7.71(brs, 1H); 7.50-7.41(m, 5 H); 7.26 (brs, 2H); 5.32-5.29(m, 1H); 4.98-4.93(m, 2H); 4.61- 4.59(m, 2H); 4.34-4.28(m, 2H); 4.24-4.21(m, 1H). 2.20

(DMSO, 400 MHz): 8.69(d, J = 2.4 Hz, 1H); 8.63(d, J = 2.4 Hz, 1H); 7.53-7.47(m, 5 H); 7.71(br, 2H); 4.97- 4.88(m, 2H); 4.59(s, 2 H); 4.33-4.21(m, 3H). 2.21

(CDCl₃, 400 MHz): 8.65-8.61(m, 2 H); 8.12-8.10(m, 2 H); 7.70-7.68(m, 2 H); 7.59-7.57(m, 2 H); 7.36-7.34 (m, 2 H); 5.21-5.10(m, 2 H); 4.64-4.61(m, 1 H); 4.51- 4.50(m, 1 H); 4.32-4.29(m, 1 H); 2.68(s, 3H). 2.22

(CDCl₃, 400 MHz): 8.63-8.59(m, 2 H); 8.09-8.07(m, 2H); 7.64-7.62(m, 4H); 7.34-7.31(m, 2H); 5.15-5.14 (m, 2H); 4.60-4.58(m, 1H); 4.51-4.49(m, 1H); 4.32- 4.30(m, 1H); 2.66(s, 3H). 2.23

(CDCl₃, 400 MHz): 8.63-8.59(m, 2 H); 7.70-7.68(m, 2H); 7.54-7.47(m, 3H); 7.38-7.34(m, 3H); 7.02-7.00 (m, 4H); 5.16-5.12(m, 2H); 4.61-4.60(m, 1H); 4.58- 4.51(m, 2H); 4.48-4.46(m, 1H); 4.39-4.33(m, 1H); 3.44(s, 3H). 2.24

(CDCl₃, 400 MHz): 8.58-8.54(m, 2 H); 7.67-7.66(m, 2 H); 7.57-7.54(m, 2 H); 7.49-7.47(m, 2H); 7.34-7.32 (m, 2 H); 5.10-5.00(m, 2H); 4.52-4.51(m, 1H); 4.41- 4.40(m, 1H); 4.27-4.21(m, 1H); 3.15(s, 3 H); 3.02(s, 3 H). 2.25

(CDCl₃, 400 MHz): 8.60-8.55(m, 2 H); 7.66(brs, 2H); 7.57-7.50(m, 4H); 7.30-7.29(m, 2H); 5.10(brs, 2H); 4.56-4.55(m, 1H); 4.45-4.44(m, 2H); 4.29-4.27(m, 1H); 3.15(s, 3H); 3.04(s, 3H). 2.26

(CDCl₃, 400 MHz): 8.90-8.80(m, 2H); 8.70(s, 1H); 8.60(s, 1H); 7.85-7.72(m, 2H); 7.67-7.62(m, 2H); 7.46-7.45(m, 2H); 5.24-5.13(m, 2H); 4.66-4.62(m, 1H); 4.54-4.49(m, 1H); 4.30(brs, 1H). 2.27

(CDCl₃, 400 MHz): 8.75-8.72(m, 2H); 8.59(s, 1H); 8.54(s, 1H); 7.84-7.83(m, 1H); 7.45-7.36(m, 2H); 7.24-7.11(m, 2H); 5.19-5.08(m, 2H); 4.58-4.45(m, 2H); 4.29-4.22(m, 1H). 2.28

(CDCl₃, 400 MHz): δ (ppm) 8.69-8.60(m, 3H); 7.80(d, J = 8.0 Hz, 1H); 7.55(d, J = 8.0 Hz, 1H); 7.32-7.26(m, 3H); 7.22-7.20(m, 1H); 5.20-5.16(m, 2H); 4.68-4.64 (m, 1H); 4.55-4.51(m, 1H); 4.32-4.28(m, 1H); 2.69(s, 3H). 2.29

(CDCl₃, 400 MHz): 8.60-8.57(m, 2H); 7.81-7.79(m, 1H); 7.55-7.40(m, 1H); 7.34-7.26(m, 6H); 5.18-5.17 (m, 2H); 4.66-4.62(m, 1H); 4.52-4.48(m, 1H); 4.38- 4.34(m, 1H); 2.46(s, 3H). 2.30

(CDCl₃, 400 MHz): δ (ppm) 8.69-8.68(m, 1H); 8.61- 8.60(m, 1H); 7.89(s, 1H); 7.87-7.65(m, 5H); 7.32-7.26 (m, 2H); 5.25-5.13(m, 2H); 4.68-4.64(m, 1H); 4.55- 4.51(m, 1H); 4.29-4.26(m, 1H).

TABLE 14C STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 2.1 TO 2.30. Unless otherwise stated, all starting materials are commercially available from common vendors. Ex. # Starting Material 1 Starting Material 2 Reaction Condition 2.1

PdCl₂(dppf), Na₂CO₃, dioxane/H₂O 80° C. 2.2

PdCl₂(dppf), Na₂CO₃, dioxane/H₂O 80° C. 2.3

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.4

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.5

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.6

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.7

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.8

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.9

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.10

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.11

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.12

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.13

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.14

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.15

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.16

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.17

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.18

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.19

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.20

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.21

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.22

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.23

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.24

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.25

PdCl₂(dppf), K₃PO₄, dioxane/H₂O 80° C. 2.26

PdCl₂(dppf), K₃PO₄, dioxane/H₂O reflux 2.27

PdCl₂(dppf), K₃PO₄, dioxane/H₂O reflux 2.28

PdCl₂(dppf), K₂CO₃, dioxane/H₂O reflux 2.29

PdCl₂(dppf), K₂CO₃, dioxane/H₂O reflux 2.30

PdCl₂(dppf), K₂CO₃, dioxane/H₂O reflux

Example 3.1 (1-methyl-1H-benzoimidazol-2-yl)-[3-(3-piperidin-1-yl-pyrazin-2-yl)-azetidin-1-yl]-methanone

To a mixture of [3-(3-chloro-pyrazin-2-yl)-azetidin-1-yl]-(1-methyl-1H-benzoimidazol-2-yl)-methanone (0.10 g, 0.30 mmol), piperidine (0.052 g, 0.60 mmol) and triethylamine (0.091 g, 0.90 mmol) was added DMSO (4 mL). The solution was heated to 120° C. for 5 h. Then the mixture was diluted with water (10 mL) and extracted with EtOAc (2×20 mL). The combined organic extracts were washed with water (10 mL), brine (10 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel (20% to 50% EtOAc in petroleum ether) to give (1-methyl-1H-benzoimidazol-2-yl)-[3-(3-piperidin-1-yl-pyrazin-2-yl)-azetidin-1-yl]-methanone (0.072 g, 0.19 mmol, 63% yield) as white solid.

The following Table 15A lists compounds of Examples 3.1 to 3.54, which were made analogous to Scheme 3 by using the appropriate materials and reaction conditions, which are listed in Table 15B. The NMR data of the Examples are listed in Table 15C.

TABLE 15A EXAMPLES 3.1 TO 3.54 ESI-MS IC₅₀ Ex. # Structure Chemical Name (M + 1) (uM) 3.1

(1-Methyl-1H- benzoimidazol-2-yl)-[3-(3- piperidin-1-yl-pyrazin-2-yl)- azetidin-1-yl]-methanone 377 0.136 3.2

{3-[3-(4-Hydroxy-piperidin- 1-yl)-pyrazin-2-yl]-azetidin- 1-yl}-(1-methyl-1H- benzoimidazol-2-yl)- methanone 393 0.351 3.3

[3-(3-Piperidin-1-yl-pyrazin- 2-yl)-azetidin-1-yl]-[1-(2,2,2- trifluoro-ethyl)-1H- benzoimidazol-2-yl]- methanone 445 0.575 3.4

{3-[3-(4-Hydroxy-piperidin- 1-yl)-pyrazin-2-yl]-azetidin- 1-yl}-[1-(2,2,2-trifluoro- ethyl)-1H-benzoimidazol-2- yl]-methanone 461 0.963 3.5

(1H-Benzoimidazol-2-yl)-[3- (3-pyrrolidin-1-yl-pyrazin-2- yl)-azetidin-1-yl]-methanone 349 0.0217 3.6

(1H-Benzoimidazol-2-yl)-{3- [3-(4-trifluoromethyl- piperidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone 431 0.0205 3.7

(R & S)-(1H-Benzoimidazol- 2-yl)-{3-[3-(2-methyl- piperidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone 377 0.0636 3.8

(1H-Benzoimidazol-2-yl)-{3- [3-(3-methyl-piperidin-1-yl)- pyrazin-2-yl]-azetidin-1-yl}- methanone 377 0.016 3.9

(1H-benzoimidazol-2-yl)-{3- [3-(4-methyl-piperidin-1-yl)- pyrazin-2-yl]-azetidin-1-yl}- methanone 377 0.0272 3.10

(1H-Benzoimidazol-2-yl)-{3- [3-(4,4-dimethyl-piperidin-1- yl)-pyrazin-2-yl]-azetidin-1- yl}-methanone 391 0.0481 3.11

(1H-Benzoimidazol-2-yl)-{3- [3-(4-hydroxymethyl- piperidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone 393 0.0072 3.12

(1H-Benzoimidazol-2-yl)-(3- {3-[4-(1-hydroxy-1-methyl- ethyl)-piperidin-1-yl]- pyrazin-2-yl}-azetidin-1-yl)- methanone 421 0.0563 3.13

(1H-Benzoimidazol-2-yl)-(3- {3-[4-(1-hydroxy-1-methyl- ethyl)-piperidin-1-yl]- pyrazin-2-yl}-azetidin-1-yl)- methanone 393 0.0381 3.14

1-{3-[1-(1H- Benzoimidazole-2-carbonyl)- azetidin-3-yl]-pyrazin-2-yl}- piperidine-4-carbonitrile 388 0.00529 3.15

(1H-Benzoimidazol-2-yl)-{3- [3-(4-methoxymethyl- piperidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone 407 0.0185 3.16

(R & S)-(1H-Benzoimidazol- 2-yl)-{3-[3-(3-methyl- pyrrolidin-1-yl)-pyrazin-2- yl]-azetidin-1-yl}-methanone 363 0.00892 3.17

(R & S)-(1H- Benzoimidazol-2-yl)-{3-[3- (2-methyl-pyrrolidin-1-yl)- pyrazin-2-yl]-azetidin-1-yl}- methanone 363 0.0149 3.18

(1H-Benzoimidazol-2-yl)-{3- [3-(3,4-dihydro-1H- isoquinolin-2-yl)-pyrazin-2- yl]-azetidin-1-yl}-methanone 411 0.00676 3.19

(1H-Benzoimidazol-2-yl)-{3- [3-(1,3-dihydro-isoindol-2- yl)-pyrazin-2-yl]-azetidin-1- yl}-methanone 397 0.043 3.20

(R & S)-(1H-Benzoimidazol- 2-yl)-{3-[3-(3-phenyl- pyrrolidin-1-yl)-pyrazin-2- yl]-azetidin-1-yl}-methanone 425 0.0468 3.21

(R & S)-(1H-Benzoimidazol- 2-yl)-{3-[3-(2-phenyl- pyrrolidin-1-yl)-pyrazin-2- yl]-azetidin-1-yl}-methanone 425 0.163 3.22

(1H-Benzoimidazol-2-yl)-[3- (3-cyclopentylamino-pyrazin- 2-yl)-azetidin-1-yl]- methanone 363 0.0363 3.23

(1H-Benzoimidazol-2-yl)-[3- (3-cyclohexylamino-pyrazin- 2-yl)-azetidin-1-yl]- methanone 377 0.0389 3.24

(1H-Benzoimidazol-2-yl)-[3- (3-benzylamino-pyrazin-2- yl)-azetidin-1-yl]-methanone 385 0.171 3.25

(1H-Benzoimidazol-2-yl)-{3- [3-(2-hydroxy-ethylamino)- pyrazin-2-yl]-azetidin-1-yl}- methanone 339 0.74 3.26

(1H-benzo[d]imidazol-2- yl)(3-(3-((2- methoxyethyl)amino)pyrazin- 2-yl)azetidin-1-yl)methanone 353 0.0586 3.27

1-{3-[1-(1H- Benzoimidazole-2-carbonyl)- azetidin-3-yl]-pyrazin-2-yl}- piperidine-4-carboxylic acid amide 406 0.00312 3.28

(R & S)-(1H-Benzoimidazol- 2-yl)-{3-[3-(3- hydroxymethyl-piperidin-1- yl)-pyrazin-2-yl]-azetidin-1- yl}-methanone 393 0.0206 3.29

(1H-Benzoimidazol-2-yl)-{3- [3-(3-hydroxy-piperidin-1- yl)-pyrazin-2-yl]-azetidin-1- yl}-methanone 379 0.0352 3.30

[3-(3-Azepan-1-yl-pyrazin-2- yl)-azetidin-1-yl]-(1H- benzoimidazol-2-yl)- methanone 379 0.0342 3.31

[3-(3-Azetidin-1-yl-pyrazin- 2-yl)-azetidin-1-yl]-(1H- benzoimidazol-2-yl)- methanone 335 0.0882 3.32

(R)-(1H-Benzoimidazol-2- yl)-{3-[3-(2-hydroxymethyl- pyrrolidin-1-yl)-pyrazin-2- yl]-azetidin-1-yl}-methanone 379 0.104 3.33

(1H-Benzoimidazol-2-yl)-[3- (3-isopropylamino-pyrazin-2- yl)-azetidin-1-yl]-methanone 337 0.133 3.34

(S)-(1H-Benzoimidazol-2- yl)-{3-[3-(2-hydroxymethyl- pyrrolidin-1-yl)-pyrazin-2- yl]-azetidin-1-yl}-methanone 379 0.917 3.35

(1H-Benzoimidazol-2-yl)-(3- {3-[4-(2-hydroxy-ethyl)- piperidin-1-yl]-pyrazin-2-yl}- azetidin-1-yl)-methanone 407 0.0094 3.36

(1H-Benzoimidazol-2-yl)-[3- (3-[1,4]oxazepan-4-yl- pyrazin-2-yl)-azetidin-1-yl]- methanone 379 0.0627 3.37

(1H-Benzoimidazol-2-yl)-{3- [3-(4-methyl-[1,4]diazepan- 1-yl)-pyrazin-2-yl]-azetidin- 1-yl}-methanone 392 4.28 3.38

1-(4-{3-[1-(1H- Benzoimidazole-2-carbonyl)- azetidin-3-yl]-pyrazin-2-yl}- [1,4]diazepan-1-yl)-ethanone 420 0.0859 3.39

(1H-Benzoimidazol-2-yl)-{3- [3-(4-hydroxy-azepan-1-yl)- pyrazin-2-yl]-azetidin-1-yl}- methanone 393 0.0368 3.40

(R & S)-(1H- Benzoimidazol-2-yl)-{3-[3- (3-hydroxymethyl-pyrrolidin- 1-yl)-pyrazin-2-yl]-azetidin- 1-yl}-methanone 379 0.0665 3.41

(R)-(1H-Benzoimidazol-2- yl)-{3-[3-(3-hydroxy- piperidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone 379 0.0709 3.42

(S)-(1H-Benzoimidazol-2- yl)-{3-[3-(3-hydroxy- piperidin-1-yl)-pyrazin-2-yl]- azetidin-1-yl}-methanone 379 0.170 3.43

(R & S)-1-{3-[1-(1H- Benzoimidazole-2-carobnyl)- azetidin-3-yl]-pyrazin-2-yl}- piperidine-3-carbonitrile 388 0.0868 3.44

1-{3-[1-(1H- Benzoimidazole-2-carbonyl)- azetidin-3-yl]-pyrazin-2-yl}- piperidine-4-carboxylic acid methylamide 420 0.016 3.45

1-{3-[1-(1H- Benzoimidazole-2-carbonyl)- azetidin-3-yl]-pyrazin-2-yl}- piperidine-4-carboxylic acid dimethylamide 434 0.0166 3.46

1-(1-(3-(1-(1H- benzo[d]imidazole-2- carbonyl)azetidin-3- yl)pyrazin-2-yl)piperidin-4- yl)ethanone 405 0.0119 3.47

1-(4-(3-(1-(1H- benzo[d]imidazole-2- carbonyl)azetidin-3- yl)pyrazin-2-yl)piperazin-1- yl)ethanone 406 0.192 3.48

(R)-(1H-benzo[d]imidazol-2- yl)(3-(3-(3- hydroxypyrrolidin-1- yl)pyrazin-2-yl)azetidin-1- yl)methanone 365 0.0718 3.49

(S)-(1H-benzo[d]imidazol-2- yl)(3-(3-(3- hydroxypyrrolidin-1- yl)pyrazin-2-yl)azetidin-1- yl)methanone 365 0.0632 3.50

(1H-benzo[d]imidazol-2- yl)(3-(3-(piperidin-1- yl)pyrazin-2-yl)azetidin-1- yl)methanone 363 0.0107 3.51

(1H-benzo[d]imidazol-2- yl)(3-(3-(4-hydroxypiperidin- 1-yl)pyrazin-2-yl)azetidin-1- yl)methanone 379 0.0233 3.52

(1H-Benzoimidazol-2-yl)-{3- [3-(2-oxa-7-aza- spiro[3.5]non-7-yl)-pyrazin- 2-yl]-azetidin-1-yl}- methanone 405 0.0276 3.53

(1H-Benzoimidazol-2-yl)-{3- [3-(2-oxa-6-aza- spiro[3.3]hept-6-yl)-pyrazin- 2-yl]-azetidin-1-yl}- methanone 377 0.1320 3.54

1-(6-{3-[1-(1H- Benzoimidaozle-2-carbonyl)- azetidin-3-yl]-pyrazin-2-yl}- 2,6-diaza-spiro[3.3]hept-2- yl)-ethanone 418 0.4900

TABLE 15B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 3.1 TO 3.54. Unless otherwise stated, all starting materials are commercially available from common vendors. Ex. # Starting Material 1 Starting Material 2 Reaction Condition 3.1

TEA, DMSO 120° C. 3.2

TEA, DMSO 120° C. 3.3

TEA, DMSO 120° C. 3.4

TEA, DMSO 120° C. 3.5

TEA, DMSO 120° C. 3.6

TEA, DMSO 120° C. 3.7

TEA, DMSO 120° C. 3.8

TEA, DMSO 120° C. 3.9

TEA, DMSO 120° C. 3.10

TEA, DMSO 120° C. 3.11

TEA, DMSO 120° C. 3.12

TEA, DMSO 120° C. 3.13

TEA, DMSO 120° C. 3.14

TEA, DMSO 120° C. 3.15

TEA, DMSO 120° C. 3.16

TEA, DMSO 120° C. 3.17

TEA, DMSO 120° C. 3.18

TEA, DMSO 120° C. 3.19

TEA, DMSO 120° C. 3.20

TEA, DMSO 120° C. 3.21

TEA, DMSO 120° C. 3.22

TEA, DMSO 120° C. 3.23

TEA, DMSO 120° C. 3.24

TEA, DMSO 120° C. 3.25

TEA, DMSO 120° C. 3.26

TEA, DMSO 120° C. 3.27

TEA, DMSO 120° C. 3.28

TEA, DMSO 120° C. 3.29

TEA, DMSO 120° C. 3.30

TEA, DMSO 120° C. 3.31

TEA, DMSO 120° C. 3.32

TEA, DMSO 120° C. 3.33

TEA, DMSO 120° C. 3.34

TEA, DMSO 120° C. 3.35

TEA, DMSO 120° C. 3.36

TEA, DMSO 120° C. 3.37

TEA, DMSO 120° C. 3.38

TEA, DMSO 120° C. 3.39

TEA, DMSO 120° C. 3.40

TEA, DMSO 120° C. 3.41

TEA, DMSO 120° C. 3.42

TEA, DMSO 120° C. 3.43

TEA, DMSO 120° C. 3.44

TEA, DMSO 120° C. 3.45

TEA, DMSO 120° C. 3.46

TEA, DMSO 120° C. 3.47

36.1 μW, 145° C. 36.2 Et₃N, Ac₂O, DCM 3.48

K₂CO₃, iPrOH, H₂O, 160° C. μW 3.49

K₂CO₃, iPrOH, H₂O, 160° C. μW 3.50

K₂CO₃, i-PrOH, H₂O, μW, 160° C. 3.51

K₂CO₃, i-PrOH, H₂O, μW, 160° C. 3.52

TEA, DMSO 120° C. 3.53

TEA, DMSO 120° C. 3.54

TEA, DMSO 120° C.

TABLE 15C 1H NMR (PPM) DATA FOR EXAMPLES 3.1 TO 3.54 Ex. # Structure NMR 3.1

(CD₃OD, 400 MHz): 8.11 (d, J = 2.4 Hz, 1H); 8.30 (d, J = 2.4 Hz, 1H); 7.68-7.66 (m, 1H); 7.51- 7.49 (m, 1H); 7.37-7.33 (m, 1H); 7.29-7.25 (m, 1H); 5.03-4.98 (m, 1H); 4.79-4.76 (m, 1H); 4.53- 4.49 (m, 1H); 4.41-4.39 (m, 1H); 4.26-4.23 (m, 1H); 4.05 (s, 3 H); 3.03-3.00 (m, 4 H); 1.72- 1.67 (m, 4H); 1.61-1.57 (m, 2 H). 3.2

(CD₃OD, 400 MHz): 8.17-8.16 (m, 1H); 8.10- 8.09 (m, 1H); 7.71-7.69 (m, 1H); 7.58-7.55 (m, 1H); 7.41-7.39 (m, 1H); 7.37-7.29 (m, 1H); 5.04- 5.01 (m, 1H); 4.79-4.76 (m, 1H); 4.57-4.54 (m, 1H); 4.46-4.45 (m, 1H); 4.31-4.26 (m, 1H); 4.09 (s, 3 H); 3.38-3.34 (m, 1H); 2.95-2.89 (m, 2 H); 1.99-1.97 (m, 2H); 1.69-1.67 (m, 2H). 3.3

(CD₃OD, 400 MHz): 8.14 (d, J = 2.4 Hz, 1H); 8.08 (d, J = 2.4 Hz, 1H); 7.75-7.73 (m, 1H); 7.63- 7.61 (m, 1H); 7.44-7.40 (m, 1H); 7.36-7.33 (m, 1H); 5.63-5.58 (m, 2 H); 5.12-5.07 (m, 1H); 4.92- 4.90 (m, 1H); 4.54-4.52 (m, 1H); 4.44-4.40 (m, 1H); 4.31-4.28 (m, 1H); 3.06-3.03 (m, 4H); 1.75- 1.69 (m, 4 H); 1.64-1.59 (m, 2H). 3.4

(CD₃OD, 400 MHz): 8.16 (d, J = 2.8 Hz, 1H); 8.09 (d, J = 2.8 Hz, 1H); 7.76-7.74 (m, 1H); 7.64- 7.62 (m, 1H); 7.45-7.43 (m, 1H); 7.37-7.33 (m, 1H); 5.64-5.58 (m, 2H); 5.10-5.08 (m, 1H); 4.93- 4.89 (m, 1H); 4.56-4.53 (m, 1H); 4.45-4.41 (m, 1H); 4.38-4.31 (m, 1H); 3.78-3.76 (m, 4H); 3.38- 3.36 (m, 2 H); 2.95-2.90 (m, 2H); 2.00-1.96 (m, 2H); 1.70-1.67 (m, 2H) 3.5

(CDCl₃, 400 MHz): 7.98-7.96 (m, 2H); 7.74-7.64 (m, 2H); 7.31-7.26 (m, 2H); 5.25-5.12 (m, 2H); 4.80-4.76 (m, 1H); 4.60-4.55 (m, 1H); 4.35-4.29 (m, 1H); 3.51-3.49 (m, 4H); 2.04-1.99 (m, 4H). 3.6

(CDCl₃, 400 MHz): 8.21 (d, J = 2.4 Hz, 1H); 8.12 (d, J = 2.4, 1H); 7.67 (br, 2H); 7.33-7.31 (m, 2H); 5.32-5.27 (m, 1H); 5.10-5.06 (m, 1H); 4.63-4.61 (m, 2H); 4.30-4.26 (m, 1H); 3.45 (s, 2H); 2.93- 2.81 (m, 2H); 2.26-2.19 (m, 1H); 1.99-1.98 (m, 2H); 1.87-1.74 (m, 2H). 3.7

(CDCl₃, 400 MHz): 8.26-8.23 (m, 2H); 7.73-7.71 (m, 2H); 7.38-7.35 (m, 2H); 5.32-5.23 (m, 1H); 5.07-5.00 (m, 1H); 4.60-4.45 (m, 2H); 4.49-4.47 (m, 3H); 3.51-3.48 (m, 1H); 3.12-3.08 (m, 1H); 3.03-2.91 (m, 1H); 1.88-1.73 (m, 4H); 1.57-1.55 (m, 2H); 1.01-0.99 (m, 1H); 1.51-1.47 (m, 3H) 3.8

(CDCl₃, 400 MHz): 8.10-8.04 (m, 2H); 7.75-7.74 (m, 1H); 7.51-7.50 (m, 1H); 7.29-7.19 (m, 1H); 5.24-5.18 (m, 1H); 5.07-5.04 (m, 1H); 4.57-4.56 (m, 2H); 4.25-4.21 (m, 1H); 3.25-3.22 (m, 2H); 2.75-2.70 (m, 1H); 2.48-2.39 (m, 1H); 1.83-1.65 (m, 4H); 1.07-1.03 (m, 1H); 0.91 (d, J = 6.4 Hz, 3H) 3.9

(CDCl₃, 400 MHz): 8.11-8.05 (m, 2H); 7.75-7.74 (m, 1H); 7.51-7.50 (m, 1H); 7.25-7.19 (m, 2H); 5.26-5.21 (m, 1H); 5.07-5.04 (m, 1H); 4.57-4.56 (m, 2H); 4.26-4.23 (m, 1H); 3.34-3.29 (m, 2 H); 2.78-2.74 (m, 2H); 1.75-1.72 (m, 2H); 1.55-1.53 (m, 1H); 1.38-1.31 (m, 2 H); 0.97 (d, J = 6.4 Hz, 3H). 3.10

(CDCl₃, 400 MHz): 8.14-8.10 (m, 2H); 7.70-7.68 (m, 2H); 7.32-7.24 (m, 2H); 5.30-5.26 (m, 1H); 5.08-5.03 (m, 1H); 4.62-4.60 (m, 2H); 4.29-4.25 (m, 1H); 3.10-3.08 (m, 4H); 1.55-1.53(m, 4H); 1.01 (s, 6H). 3.11

(CDCl₃, 400 MHz): 8.14-8.13 (m, 1H); 8.08-8.07 (m, 1H); 7.77-7.75 (m, 1H); 7.55-7.52 (m, 1H); 7.30-7.22 (m, 2H); 5.27-5.21 (m, 1H); 5.07-5.04 (m, 1H); 4.60-4.58 (m, 2H); 4.25-4.21 (m, 1H); 3.58-3.55 (m, 2H); 3.40-3.34 (m, 2H); 2.89-2.77 (m, 2H); 2.41 (br, 1H); 1.87-1.84 (m, 1H); 1.69- 1.68 (m, 1H); 1.49-1.40 (m, 2H). 3.12

(CD₃OD, 400 MHz): 8.16 (d, J = 2.4 Hz, 1H); 8.09 (d, J = 2.4 Hz, 1H); 7.63 (brs, 2H); 7.30-7.28 (m, 2H); 5.20-5.16 (m, 1H); 4.98-4.93 (m, 1H); 4.60-4.56 (m, 1H); 4.47-4.43 (m, 1H); 4.37-4.35 (m, 1H); 3.46(d, J = 12.4 Hz, 2H); 2.83-2.78 (m, 2H); 1.89-1.86 (m, 2H); 1.56-1.46 (m, 3H); 1.19 (s, 6H) 3.13

(CDCl₃, 400 MHz): 8.12 (d, J = 2.4 Hz, 1H); 8.04 (d, J = 2.4 Hz, 1H); 7.79 (br, 1H); 7.51 (br, 1H); 7.19 (br, 2H); 5.25-5.20 (m, 1H); 5.04-5.00 (m, 1H); 4.58-4.56 (m, 2H); 4.24-4.21 (m, 1H); 3.38- 3.35 (m, 1H); 3.31 (s, 3H); 3.30-3.27 (m, 2H); 2.94-2.89 (m, 2H); 2.02-1.98 (m, 2H); 1.73-1.68 (m, 2H). 3.14

(CDCl₃, 400 MHz): 8.20 (d, J = 42.4 Hz, 1H); 8.13 (d, J = 2.4 Hz, 1H); 7.70-7.68 (m, 2H); 7.35- 7.32 (m, 2H); 5.32-5.27 (m, 1H); 5.03-4.99 (m, 1H); 4.64-4.56 (m, 2H); 4.29-4.23 (m, 1H); 3.34- 3.29 (m, 2H); 3.09-3.02 (m, 2H); 2.86-2.82 (m, 1H); 2.12-1.97 (m, 4H). 3.15

(CDCl₃, 400 MHz): 8.15-8.06 (m, 2H); 7.376-7.74 (m, 1H); 7.52-7.50 (m, 1H); 7.28-7.24 (m, 2H); 5.27-5.22 (m, 1H); 5.07-5.04 (m, 1H); 4.61-4.58 (m, 2H); 4.27-4.24 (m, 1H); 3.36-3.27 (m, 7H); 2.89-2.78 (m, 2H); 1.92-1.78 (m, 3H); 1.49-1.40 (m, 2H). 3.16

(CDCl₃, 400 MHz): 7.95-7.93 (m, 2H); 7.67 (brs, 2H); 7.32-7.24 (m, 2H); 5.25-5.12 (m, 2H); 4.72- 4.70 (m, 1H); 4.62-4.48 (m, 1H); 4.31-4.27 (m, 1H); 3.63-3.48 (m, 3H); 3.19-3.12 (m, 1H); 2.34- 2.32 (m, 1H); 2.12-2.09 (m, 1H); 1.61-1.58 (m, 1H); 1.14-1.12 (m, 3H). 3.17

(CDCl₃, 400 MHz): 7.98-7.96 (m, 2H); 7.75-7.59 (m, 2H); 7.26-7.24 (m, 2H); 5.31-5.08 (m, 2H); 4.69-4.47 (m, 2H); 4.21-4.19 (m, 2H); 3.70-3.68 (m, 1H); 3.13-3.11 (m, 1H); 2.16-2.15 (m, 1H); 1.95-1.94 (m, 1H); 1.77-1.76 (m, 1H); 1.63-1.62 (m, 1H); 1.18 (s, 3H) 3.18

(CDCl₃, 400 MHz): 8.20-8.13 (m, 2H); 7.68 (brs, 2H); 7.33-7.32 (m, 2H); 7.24-7.16 (m, 4H); 5.34- 5.29 (m, 1H); 5.15-5.11 (m, 1H); 4.68-4.59 (m, 2H); 4.46-4.31 (m, 3H); 3.42-3.40 (m, 2H); 3.16- 3.05 (m, 2H). 3.19

(CDCl₃, 400 MHz): 8.07-8.06 (rn, 1H); 8.00-7.99 (m, 1H); 7.70-7.48 (m, 1H); 7.39-7.37 (m, 2H); 7.29-7.17 (m, 4H); 5.07-5.05 (m, 1H); 5.00-4.90 (m, 6H); 4.52-4.46 (m, 2H). 3.20

(CDCl₃, 400 MHz): 7.98-7.96 (m, 2H); 7.69-7.68 (m, 2H); 7.35-7.30 (m, 4H); 7.28-7.15 (m, 3H); 5.27-5.23 (m, 1H); 5.13-5.07 (m, 1H); 4.67-4.63 (m, 1H); 4.55-4.43 (m, 1H); 4.34-4.32 (m, 1H); 3.83-3.75 (m, 2H); 3.70-3.65 (m, 2H); 3.48-3.46 (m, 1H); 2.41-2.39 (m, 1H); 2.14-2.12 (m, 1H). 3.21

(CDCl₃, 400 MHz): 7.93-7.89 (m, 2H); 7.67 (brs, 2H); 7.50-7.24 (m, 6H); 7.17-7.15 (m, 1H); 5.23- 5.05 (m, 3H); 4.65-4.63 (m, 1H); 4.53-4.51 (m, 1H); 4.27-4.26 (m, 1H); 3.97-3.95 (m, 1H); 3.42- 3.40 (m, 1H); 2.42-2.41 (m, 1H); 2.07-2.06 (m, 1H); 2.00-1.84 (m, 2H). 3.22

(CDCl₃, 400 MHz): 7.98 (d, J = 2.8 Hz, 1H); 7.80 (d, J = 2.8 Hz, 1H); 7.69 (brs, 2H); 7.34-7.30 (m, 2H); 5.31-5.26 (m, 1H); 5.16-5.12 (m, 1H); 4.78- 4.74 (m, 1H); 4.65-4.60 (m, 1H); 4.35-4.33 (m, 1H); 4.11-4.10 (m, 1H); 3.95-3.88 (m, 1H); 2.17- 2.09 (m, 2H); 1.79-1.66 (m, 4H); 1.51-1.43 (m, 2H). 3.23

(CDCl₃, 400 MHz): 7.89-7.72 (m, 2H); 7.62 (brs, 2H); 7.30-7.26 (m, 2H); 5.25-5.20 (m, 1H); 5.11- 5.08 (m, 1H); 4.66-4.53 (m, 2H); 3.95-3.84 (m, 2H); 2.02-1.99 (m, 1H); 1.73-1.35 (m, 6H); 1.21- 1.16 (m, 3H). 3.24

(CD₃OD, 400 MHz): 7.83-7.81 (m, 2H); 7.70-7.68 (m, 2H); 7.39-7.21 (m, 7H); 5.19-5.13 (m, 1H); 5.10-5.06 (m, 1H); 4.67 (s, 2H); 4.63-4.54 (m, 2H); 4.25-4.21 (m, 1H). 3.25

(CD₃OD, 400 MHz): 7.89-7.88 (m, 1H); 7.80- 7.79 (m, 1H); 7.69-7.66 (m, 2H); 7.37-7.35 (m, 2H); 5.19-5.18 (m, 1H); 5.06-5.08 (m, 1H); 4.62- 4.55 (m, 2H); 4.24-4.20 (m, 1H); 3.80-3.79 (m, 2H); 3.63-3.61 (m, 2 H). 3.26

(CDCl₃, 400 MHz): 7.94 (d, J = 2.4 Hz, 1H); 7.82 (d, J = 2.4 Hz, 1H); 7.78-7.60 (m, 2H); 7.32-7.31 (m, 2H); 5.29-5.28 (m, 1H); 5.16-5.14 (m, 1H); 4.76-4.73 (m, 2H); 4.65-4.63 (m, 1H); 4.00-3.95 (m, 1H); 3.71-3.61 (m, 4H); 3.43 (s, 3H). 3.27

(CDCl₃, 400 MHz): 8.22-8.16 (m, 2 H); 7.65 (br, 2H); 7.62-7.54 (m, 4H); 5.11-5.07 (m, 1H); 4.89- 4.85 (m, 1H); 4.51-4.49 (m, 1H); 4.29-4.25 (m, 2H); 3.45-3.43 (m, 2 H); 2.83-2.73 (m, 1H); 2.52- 2.51 (m, 1H); 1.82-1.71 (m, 4 H). 3.28

(CD₃OD, 400 MHz): 8.18 (d, J = 2.4 Hz, 1H); 8.11 (d, J = 2.4 Hz, 1H); 7.68-7.65 (m, 2H); 7.35- 7.32 (m, 2H); 5.21-5.17 (m, 1H); 5.02-4.95 (m, 1H); 4.65-4.59 (m, 1H); 4.47-4.36 (m, 2H); 3.57- 3.53 (m, 1H); 3.48-3.34 (m, 3H); 2.86-2.84 (m, 1H); 2.64-2.58 (m, 1H); 1.96-1.94 (m, 1H); 1.85- 1.76 (m, 3H); 1.21-1.18 (m, 1H). 3.29

(CD₃OD, 400 MHz): 8.17 (d, J = 2.4 Hz, 1H); 8.10 (d, J = 2.4 Hz, 1H); 7.63 (brs, 2H); 7.28-7.20 (m, 2H); 5.20-5.14 (m, 1H); 4.97-4.92 (m, 1H); 4.58-4.53 (m, 1H); 4.47-4.42 (m, 1H); 4.38-4.32 (m, 1H); 3.89-3.85 (m, 1H); 3.41-3.37 (m, 1H); 3.34-3.20 (m, 1H); 2.88-2.77 (m, 2H); 2.02-1.98 (m, 1H); 1.91-1.88 (m, 1H); 1.71-1.67 (m, 1H); 1.49-1.46 (m, 1H). 3.30

(CDCl₃, 400 MHz): 8.04-8.00 (m, 2H); 7.73-7.70 (m, 2H); 7.38-7.36 (m, 2H); 5.27-5.22 (m, 1H); 5.03-4.99 (m, 1H); 4.60-4.53 (m, 2H); 4.27-4.23 (m, 1H); 3.45-3.42 (m, 4H); 1.83 (brs, 4H) 1.65- 1.63 (m, 6H). 3.31

(CD₃OD, 400 MHz): 7.97-7.92 (m, 2H); 7.76-7.74 (m, 1H); 7.59-7.58 (m, 1H); 7.32 (br, 2H); 5.15- 5.13 (m, 1H); 5.04-5.01 (m, 1H); 4.57-4.50 (m, 2 H); 4.20-4.14 (m, 5H); 2.45-2.37 (m, 1H). 3.32

(CDCl₃, 400 MHz): 7.97-7.94 (m, 1H); 7.84-7.81 (m, 1H); 7.71-7.65 (m, 2H); 7.22 (brs, 2H); 5.27- 5.23 (m, 1H); 5.01 -5.02 (m, 1H); 4.62-4.56 (m, 2H); 4.39-4.36 (m, 1H); 4.20-4.15 (m, 1H); 3.77- 3.60 (m, 3H); 3.20-3.15 (m, 1H); 2.09 (s, 3H); 1.95-1.92 (m, 1H); 1.77-1.75 (m, 2 H). 3.33

(CD₃OD, 400 MHz): 7.88-7.81 (m, 2H); 7.68-7.66 (m, 2H); 7.35-7.33 (m, 2H); 5.20-5.15 (m, 1H); 5.03-4.99 (m, 1H); 4.62-4.50 (m, 2H); 4.28-4.17 (m, 1H); 4.15-4.10 (m, 1H); 1.33-1.30 (m, 6H). 3.34

(CDCl₃, 400 MHz): 7.96-7.94 (m, 1H); 7.83-7.81 (m, 1H); 7.70-7.60 (m, 2H); 7.22 (brs, 2H); 5.26- 5.24 (m, 1H); 5.011-5.02 (m, 1H); 4.61-4.56 (m, 2H); 4.38-4.36 (m, 1H); 4.18-4.16 (m, 1H); 3.76- 3.59 (m, 3H); 3.15-3.13 (m, 1H); 2.08 (s, 3H); 1.94-1.92 (m, 1H); 1.76-1.73 (m, 2 H). 3.35

(CDCl₃, 400 MHz): 8.20-8.17 (m, 2H); 7.75-7.72 (m, 2 H); 7.43-7.40 (m, 2H); 5.33-5.32 (m, 1H); 505-5.02 (m, 1H); 4.63-4.61 (m, 2H); 4.57-4.55 (m, 1H); 4.36-4.34 (m, 1H); 3.79-3.77 (m, 1H); 3.42-3.36 (m, 2H); 2.95-2.90 (m, 2 H); 1.89-1.79 (m, 3 H); 1.65-1.67 (m, 2 H); 1.47-1.45 (m, 2H). 3.36

(CD₃OD, 400 MHz): 8.11-8.06 (m, 2 H); 7.72- 7.70 (m, 2H); 7.43-7.40 (m, 2H); 5.16-5.11 (m, 1H); 5.00-4.98 (m, 1H); 4.59-4.52 (m, 2H); 4.34- 4.33 (m, 1H); 3.89-3.82 (m, 4H); 2.06-2.03 (m, 2H). 3.37

(CD₃OD, 400 MHz): 8.17-8.16 (m, 1H); 8.08- 8.07 (m, 1H); 7.68-7.66 (m, 2H); 7.36-7.34 (m, 2H); 5.17-5.14 (m, 1H); 4.95-4.94 (m, 1H); 4.59- 4.52 (m, 2H); 4.35-4.27 (m, 1H); 3.76-3.57 (m, 6H); 3.37-3.31 (m, 2H); 3.30 (s, 3H); 2.26-2.24 (m, 2 H). 3.38

(CDCl₃, 400 MHz): 8.13-8.07 (m, 2H); 7.73-7.70 (m, 2H); 7.44-7.41 (m, 2H); 5.12-5.09 (m, 1H); 4.95-4.94 (m, 1H); 4.62-4.51 (m, 2H); 4.33-4.30 (m, 1H); 3.79-3.76 (m, 2H); 3.66-3.60 (m, 3H); 3.48-3.45 (m, 2H); 3.42-3.40 (m, 1H); 2.11 (s, 3H); 2.05-2.02 (m, 1H); 1.94-1.88 (m, 1H). 3.39

(CD₃OD, 400 MHz): 8.05-8.00 (m, 2 H); 7.70- 7.68 (m, 2H); 7.39-7.36 (m, 2H); 5.15-5.13 (m, 1H); 4.99-4.98 (m, 1H); 4.56-4.50 (m, 2H); 4.33- 4.30 (m, 1H); 3.92-3.90 (m, 1H); 3.57-3.54 (m, 1H); 3.47-3.41 (m, 3H); 2.14-2.11 (m, 1H); 1.99- 1.69 (m, 5H). 3.40

(CD₃OD, 400 MHz): 7.98-7.97 (m, 1H); 7.88- 7.87 (m, 1H); 7.69-7.66 (m, 2H); 7.37-7.34 (m, 2H); 5.15-5.07 (m, 1H); 4.58-4.44 (m, 2H); 3.66- 3.60 (m, 5H); 3.45-3.43 (m, 1H); 3.65 (s, 2H); 2.55-2.51 (m, 1H); 2.16-2.11 (m, 1H); 1.85-1.80 (m, 1H). 3.41

(CDCl₃, 400 MHz): 8.19 (d, J = 2.8 Hz, 1H); 8.11 (d, J = 2.8, 1H); 7.67-7.64 (m, 2H); 7.33-7.30 (m, 2H); 5.20-5.18 (m, 1H); 4.98-4.96 (m, 1H); 4.58- 4.56 (m, 1H); 4.48-4.45 (m, 1H); 4.40-4.38 (m, 1H); 3.89-3.86 (m, 1H); 3.42-3.39 (m, 1H); 3.22- 3.18 (m, 1H); 2.90-2.89 (m, 1H); 2.84-2.80 (m, 1H); 2.02-2.00 (m, 1H); 1.93-1.90 (m, 1H); 1.74- 1.70 (m, 1H); 1.50-1.48 (m, 1H). 3.42

(CDCl₃, 400 MHz): 8.20 (d, J = 2.8 Hz, 1H); 8.12 (d, J = 2.8, 1H); 7.66 (br, 2H); 7.34-7.31 (m, 2H); 5.21-5.19 (m, 1H); 4.97-4.96 (m, 1H); 4.61-4.54 (m, 1H); 4.48-4.38 (m, 2H); 3.89-3.85 (m, 1H); 3.42-3.41 (m, 1H); 3.23-3.20 (m, 1H); 2.91-2.88 (m, 1H); 2.84-2.79 (m, 1H); 2.04-2.00 (m, 1H); 1.95-1.90 (m, 1H); 1.74-1.70 (m, 1H); 1.51-1.47 (m, 1H). 3.43

(CDCl₃, 400 MHz): 8.22 (m, 1H); 8.11 (m, 1H); 7.68-7.65 (m, 2H); 7.35-7.31 (m, 2H); 5.30 (m, 1H); 5.02 (m, 1H); 4.60 (d, J = 6.4 Hz, 2H); 4.37- 4.34 (m, 1H); 3.34-3.28 (m, 2H); 3.08-2.93 (m, 3H); 1.98-1.90 (m, 3H); 1.74-1.72 (m, 1H). 3.44

(CDCl₃, 400 MHz): 8.18 (d, J = 2.0 Hz, 1H); 8.12 (d, J = 2.4 Hz, 1H); 7.74-7.71 (m, 2H); 7.40-7.38 (m, 2H); 5.31 (t, J = 9.6 Hz, 1H); 5.04-5.00 (m, 1H); 4.62-4.58 (m, 2H); 4.34-4.27 (m, 1H); 3.40 (t, J = 12.0 Hz, 2H); 2.91 (d, J = 12.8 Hz, 1H); 2.86 (d, J = 4.4 Hz, 4H); 2.37-2.31 (m, 1H); 2.07- 1.87 (m, 4H). 3.45

(CDCl₃, 400 MHz): 8.14 (d, J = 2.4 Hz, 1H); 8.07 (d, J = 2.8 Hz, 1H); 7.67-7.65 (m, 2H); 5.22 (t, J = 10.0 Hz, 1H); 5.03-4.99 (m, 1H); 4.54 (d, J = 7.2 Hz, 2H); 4.28-4.24 (m, 1H); 3.37 (t, J = 12.8 Hz, 2H); 3.07 (s, 3H); 2.94 (s, 3H); 2.92-2.80 (m, 2H); 2.71-2.65 (m, 1H); 2.02-1.93 (m, 2H); 1.80 (d, J = 8.4 Hz, 2H). 3.46

(CDCl₃, 400 MHz): 8.15-8.14 (m, 1H); 8.06-8.05 (m, 1H); 7.07-7.06 (m, 1H); 7.47-7.46 (m, 1H); 7.28-7.18 (m, 2H); 5.23-5.21 (m, 1H); 5.04-5.02 (m, 1H); 4.56-5.54 (m, 2H); 4.23-4.21 (m, 1H); 3.38-3.36 (m, 2H); 2.89-2.80 (m, 2H); 2.48-2.45 (m, 1H); 2.16 (s, 3H); 1.98-1.96 (m, 2H); 1.82- 1.79 (m, 2H). 3.47

(CDCl₃, 400 MHz): 8.20 (d, J = 2.4 Hz, 1H); 8.10 (d, J = 2.4 Hz, 1H); 7.66-7.64 (m, 2H); 7.32-7.29 (m, 2H); 5.26 (t, J = 8.0 Hz, 1H); 5.03-5.00 (m, 1H); 4.60-4.54 (m, 2H); 4.28-4.25 (m, 1H); 3.81- 3.71 (m, 2H); 3.63-3.61 (m, 2H); 3.15-3.14 (m, 2H); 3.07-3.05 (m, 2H); 2.14 (s, 3H). 3.48

(MeOD, 400 MHz): 8.00-7.97 (m, 1H); 7.92-7.88 (m, 1H); 7.68 (brs, 2H); 7.36-7.35 (m, 2H); 5.18- 5.05 (m, 2H); 4.61-4.46 (m, 4H); 3.87-3.79 (m, 2H); 3.56-3.52 (m, 1H); 3.41-3.39 (m, 1H); 2.13- 1.93 (m, 2H). 3.49

(MeOD, 400 MHz): 7.96-7.92 (m, 1H); 7.91-7.89 (m, 1H); 7.68 (brs, 2H); 7.35-7.33 (m, 2H); 5.21- 4.88 (m, 2H); 4.63-4.41 (m, 4H); 3.86-3.80 (m, 2H); 3.55-3.50 (m, 1H); 3.37-3.40 (m, 1H); 2.13- 2.00 (m, 2H). 3.50

(CDCl₃, 400 MHz): 8.16 (d, J = 2.4 Hz, 1H); 8.11 (d, J = 2.4 Hz, 1H); 7.71-7.69 (m, 2H); 7.32-7.30 (m, 2H); 5.33-5.28 (m, 1H); 5.11-5.07 (m, 1H); 4.67-4.65 (m, 2H); 4.32-4.29 (m, 1H); 3.11-3.08 (m, 4H); 1.78-1.74 (m, 4H); 1.68-1.64 (m, 2H). 3.51

(MeOD, 400 MHz): 8.17 (d, J = 2.8 Hz, 1H); 8.10 (d, J = 2.8 Hz, 1H); 7.71-7.68 (m, 2H); 7.42- 7.39 (m, 2H); 5.13-5.15 (m, 1H); 4.94-4.93 (m, 1H); 4.61-4.59 (m, 1H); 4.46-4.50 (m, 1H); 4.39- 4.35 (m, 1H); 3.80-3.76 (m, 1H); 3.39-3.35 (m, 2H); 2.98-2.92 (m, 2H); 2.01-1.97 (m, 2H); 1.71- 1.68 (m, 2H). 3.52

(CDCl₃, 400 MHz): 8.19 (d, J = 2.4 Hz, 1H), 8.10 (d, J = 2.4 Hz, 1H), 7.81-7.65 (m, 1H), 7.56-7.50 (m, 1H), 7.32 (s, 2H), 5.30-5.24 (m, 1H), 5.09- 5.05 (m, 1H), 4.61 (d, J = 16 Hz, 2H), 4.49 (s, 4H), 4.32-4.24 (m, 1H), 3.04-3.01 (m, 4H), 2.07- 2.03 (m, 4H). 3.53

(CDCl₃, 400 MHz): 8.00 (d, J = 4.0 Hz, 2H), 7.76-7.59 (m, 2H), 7.31-7.29 (m, 2H), 5.24-5.19 (m, 1H), 5.12-5.08 (m, 1H), 4.87 (s, 4H), 4.81- 7.76 (m, 1H), 4.61-4.54 (m, 1H), 4.27 (s, 4H), 4.04-4.00 (m, 1H) 3.54

(MeOD, 400 MHz): 7.99 (dd, J = 2.8 Hz, 7.6 Hz, 2H), 7.66-7.62 (m, 2H), 7.33-7.30 (m, 2H), 5.17- 5.12 (m, 1H), 5.02-4.98 (m, 1H), 4.61-4.50 (m, 2H), 4.41 (s, 2H), 4.28 (s, 4H), 4.19-4.12 (m, 3H), 1.88 (s, 3H).

Example 4.1 2-(3-(3-(2-methoxypyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline

A glass microwave reaction vessel was charged with 2-(3-(3-chloropyrazin-2-yl)azetidin-1-yl)quinoline (0.160 g, 0.539 mmol), sodium carbonate (0.300 g, 2.83 mmol, JT Baker), 2-methoxy-3-pyridineboronic acid (0.150 g, 0.981 mmol, Aldrich) and trans-dichlorobis(triphenylphosphine)palladium (ii) (0.030 g, 0.043 mmol, Strem). Dioxane (3 mL) and water (1 mL) were added and the reaction mixture was sealed under argon and heated in an Initiator microwave reactor (Personal Chemistry, Biotage AB, Inc., Upssala, Sweden) at 145° C. for 15 min. The reaction mixture was partitioned between EtOAc/water and the aqueous layer was extracted with EtOAc (3×). The combined organic layers were evaporated to dryness and the residue was dissolved in MeOH and purified by reverse-phase HPLC (Gilson; Gemini-NX 10 m C18 110A AXIA, 100×50 mm column) eluting with 0.1% TFA-H₂O:0.1% TFA CH₃CN (9:1→1:9). The fractions containing the desired product were combined and concentrated in vacuo. The residue was dissolved in MeOH and loaded onto an SCX II cartridge eluting with MeOH then 2M NH₃ in MeOH to give 145 mg (73%) of an off-white amorphous solid.

The following Table 16A lists compounds of Examples 4.1 to 4.45, which were made analogous to Scheme 4 by using the appropriate materials and reaction conditions, which are listed in Table 16B. The NMR data of the Examples are listed in Table 16C.

TABLE 16A EXAMPLES 4.1 TO 4.45 ESI-MS IC₅₀ Ex. # Structure Chemical Name (M + 1) (nM) 4.1

2-(3-(3-(2-methoxypyridin-3- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 370.0 0.00234 4.2

2-(3-(3-(6-methylpyridin-3- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 354 0.00279 4.3

2-(3-(3-(2-methylpyridin-3- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 354.20 0.00648 4.4

2-(3-(3-(6-fluoropyridin-3- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 358.0 0.00418 4.5

2-(3-(3-(6- (trifluoromethyl)pyridin-3- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 408.0 0.0142 4.6

2-(3-(3-(2,6-dimethoxypyridin- 3-yl)pyrazin-2-yl)azetidin-1- yl)quinoline 400.20 0.00135 4.7

2-(3-(3-(5-fluoropyridin-3- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 358.20 0.0123 4.8

2-(3-(3-(6-methoxypyridin-3- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 2,2,2- trifluoroacetate 370.2 0.00787 4.9

2-(3-(3-(6-fluoro-5- methylpyridin-3-yl)pyrazin-2- yl)azetidin-1-yl)quinoline 2,2,2-trifluoroacetate 372.20 0.0122 4.10

2-(3-(3-(pyridin-3-yl)pyrazin-2- yl)azetidin-1-yl)quinoline 2,2,2- trifluoroacetate 340.20 0.00787 4.11

2-(3-(3-(4- (methylsulfonyl)phenyl)pyrazin- 2-yl)azetidin-1-yl)quinoline 417.2 0.00262 4.12

2,2,2-trifluoroacetatc 5-(3-(1-(quinolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)pyridin-2- amine 355.20 0.00278 4.13

5-(3-(1-(quinolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)pyridin-3- amine 355.0 0.00376 4.14

2-(3-(3-(6-methoxypyridin-2- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 370.20 0.0012 4.15

2-(3-(3-(2- (trifluoromethyl)pyridin-3- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 2,2,2- trifluoroacetate 408.0 0.12360 4.16

N,N-dimethyl-5-(3-(1-(quinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)pyrimidin-2-amine 2,2,2- trifluoroacetate 384.0 0.02279 4.17

2-(3-(3-(4-methylpyridin-3- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 2,2,2- trifluoroacetate 354.0 0.02626 4.18

2-(3-(3-(2- (methylsulfonyl)pyridin-3- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 2,2,2- trifluoroacetate 418.0 4.19

2-(3-(3-(5-methylpyridin-3- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 2,2,2- trifluoroacetate 354.0 0.01625 4.20

2-(3-(3-(5-methoxypyridin-3- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 2,2,2- trifluoroacetate 370.1 0.02472 4.21

2-(3-(3-(4-chloro-3- methylphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 387.1 0.0023 4.22

2-(3-(3-(3-fluoro-4- methylphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 371.2 0.0042 4.23

2-chloro-4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)phenol 389.0 0.0023 4.24

2-(3-(3-(3-methoxy-5- (trifluoromethyl)phenyl)pyrazin- 2-yl)azetidin-1-yl)quinoline 437.2 0.0149 4.25

2-(3-(3-(4-ethoxy-3- fluorophenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 401.2 0.0062 4.26

2-(3-(3-(3-chloro-4- ethoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 417.00 0.0106 4.27

2-(3-(3-(3-chloro-4- propoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 432.2 0.0171 4.28

2-(3-(3-(3-fluoro-5- (trifluoromethyl)phenyl)pyrazin- 2-yl)azetidin-1-yl)quinoline 425.20 0.0122 4.29

2-(3-(3-(4-methoxy-3- methylphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 383.20 0.0035 4.30

2-(3-(3-(3-fluoro-5- isopropoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 415.20 0.0110 4.31

2-(3-(3-(3-fluoro-5- methylphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 371.20 0.0051 4.32

2-(3-(3-(3-chloro-4- fluorophenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 392.20 0.0041 4.33

2-(3-(3-(3,4- difluorophenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 375.20 0.0099 4.34

2-(3-(3-(3,4- dichlorophenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 407.0 0.0084 4.35

2-(3-(3-(3,4- dimethylphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 367.20 0.0055 4.36

2-(3-(3-(3-chloro-4- methylphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 388.2 0.0067 4.37

2-(3-(3-(3-chloro-5- methylphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 387.0 0.0072 4.38

2-(3-(3-(4-fluoro-3- methylphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 371.0 0.0064 4.39

2-(3-(3-(pyrimidin-5-yl)pyrazin- 2-yl)azetidin-1-yl)quinoline 341.20 0.0887 4.40

2-(3-(3-(4-chloro-3- (trifluoromethyl)phenyl)pyrazin- 2-yl)azetidin-1-yl)quinoline 441.0 0.0091 4.41

2-(3-(3-(3,6-dihydro-2H-pyran- 4-yl)pyrazin-2-yl)azetidin-1- yl)quinoline 345 0.0011 4.42

2-(3-(3-(2,2-dimethyl-3,6- dihydro-2H-pyran-4-yl)pyrazin- 2-yl)azetidin-1-yl)quinoline and 2-(3-(3-(6,6-dimethyl-3,6- dihydro-2H-pyran-4-yl)pyrazin- 2-yl)azetidin-1-yl)quinoline 373 0.001 4.43

2-(3-(3-(1H-pyrazol-4- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 329 0.007 4.44

2-(3-(3-(3-fluoro-5- (trifluoromethyl)phenyl)pyrazin- 2-yl)azetidin-1-yl)quinoline 425.20 0.0122 4.45

2-(3-(3-(6-methoxypyridin-2- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 370.20 0.0012

TABLE 16B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 4.1 TO 4.45. Reaction Purification Ex. # Key Starting Material (s) Key Starting Material (s) Condition Method* 4.1

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW A 4.2

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW A 4.3

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW B 4.4

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW B 4.5

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW B 4.6

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW B 4.7

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW B 4.8

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW E 4.9

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW E 4.10

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW E 4.11

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW E 4.12

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.13

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.14

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.15

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW C 4.16

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW C 4.17

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW C 4.18

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW C 4.19

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW C 4.20

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW C 4.21

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.22

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.23

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.24

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.25

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.26

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.27

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.28

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.29

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.30

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.31

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.32

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.33

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.34

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.35

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.36

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.37

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.38

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.39

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.40

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.41

Pd(tBu₃P)₂, KOAc Dioxane/water, 125° C./μW, 30 min E 4.42

Pd(tBu₃P)₂, KOAc Dioxane/water, 135° C./μW, 30 min E 4.43

Pd(tBu₃P)₂, KOAc Dioxane/water, 135° C./μW, 30 min F 4.44

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D 4.45

PdCl₂(PPh₃)₂, Na₂CO₃ Dioxane/water, 145° C., μW D Unless otherwise stated, all starting materials are commercially available from common vendors. *Purification Methods: Method A- reverse-phase HPLC (Gilson; Gemini-NX 10 m C18 110A AXIA, 100 × 50 mm column) eluting with 0.1% TFA-H₂O: 0.1% TFA CH₃CN (9:1 → 1:9). The fractions containing the desired product were combined and concentrated in vacuo. The residue was dissolved in MeOH and loaded onto an SCX II cartridge eluting with MeOH then 2M NH₃ in MeOH. Method B- reverse-phase HPLC (Instrumentation: MS-Waters SQ; UV-Waters 2487 or Waters PD; Solvents: A: Water w/0.1% NH₄OH B: Acetonitrile w/0.1% NH₄OH; Column: Phenomenex Gemini-NX C18 110A 5 um 21 × 100; Flow Rate: 44 mL/min. 10 min Method, variable gradient over 8 mins. Method C- reverse-phase HPLC (Gilson; Gemini-NX 10 m C18 110A AXIA, 100 × 50 mm column) eluting with 0.1% TFA-H₂O: 0.1% TFA CH₃CN (9:1 → 1:9). The fractions containing the desired product were combined and concentrated in vacuo. Method D- reverse-phase HPLC (Instrument: Waters Autopurificaton system; Column: Xbridge 19 × 100 mm, 10 um; Flow rate: 40 ml/min; Mobile phase: 0.1% NH₄OH in acetonitrile (B) and water (A)). Method E- reverse-phase HPLC (Instrument: Waters Autopurificaton system; Column: Xbridge 19 × 100 mm, 10 um; Flow rate: 40 ml/min; Mobile phase: 0.1% TFA in acetonitrile (B) and water (A)). Method E- purification by silica gel chromatography eluting with a gradient of EtOAc in hexane. Method F- purification by silica gel chromatography eluting with a gradient of MeOH in DCM.

TABLE 16C 1H NMR δ (PPM) DATA FOR EXAMPLES 4.1 TO 4.45 Ex. # Structure NMR 4.1

(300 MHz, DMSO-d₆) 2.69(s, 3 H) 4.21-4.50(m, 5 H) 6.75(d, J = 8.77 Hz, 1 H) 7.21(ddd, J = 8.00, 6.47, 1.61 Hz, 1 H) 7.45(d, J = 8.04 Hz, 1 H) 7.48-7.60(m, 2 H) 7.70(d, J = 7.60 Hz, 1 H) 7.93(dd, J = 7.97, 2.41 Hz, 1 H) 8.02(d, J = 8.77 Hz, 1 H) 8.63-8.74(m, 3 H). 4.2

(300 MHz, DMSO-d₆) 2.59(s, 3 H) 4.21-4.50(m, 5 H) 6.75(d, J = 8.77 Hz, 1 H) 7.21(ddd, J = 8.00, 6.47, 1.61 Hz, 1 H) 7.45(d, J = 8.04 Hz, 1 H) 7.48-7.60(m, 2 H) 7.70(d, J = 7.60 Hz, 1 H) 7.93(dd, J = 7.97, 2.41 Hz, 1 H) 8.02(d, J = 8.77 Hz, 1 H) 8.63-8.74(m, 3 H) 4.3

(400 MHz, DMSO-d₆) 8.74(d, J = 2.35 Hz, 1 H) 8.67(d, J = 2.35 Hz, 1 H) 8.61(dd, J = 4.69, 1.56 Hz, 1 H) 8.02(d, J = 9.00 Hz, 1 H) 7.66-7.78 (m, 2 H) 7.47-7.58(m, 2 H) 7.41 (dd, J = 7.63, 4.89 Hz, 1 H) 7.21(t, J = 7.24 Hz, 1 H) 6.74(d, J = 8.61 Hz, 1 H) 4.24-4.31(m, 2 H) 4.17-4.24 (m, 2 H) 3.93-4.07(m, 1 H) 2.28 (s, 3 H). 4.4

(400 MHz, DMSO-d₆) 8.74(d, J = 2.35 Hz, 1 H) 8.68(d, J = 2.35 Hz, 1 H) 8.49(d, J = 2.35 Hz, 1 H) 8.25 (td, J = 8.12, 2.54 Hz, 1 H) 8.02(d, J = 8.61 Hz, 1 H) 7.70(d, J = 7.43 Hz, 1 H) 7.46-7.61(m, 2 H) 7.40(dd, J = 8.61, 2.74 Hz, 1 H) 7.14-7.27 (m, 1 H) 6.75(d, J = 8.61 Hz, 1 H) 4.37-4.49(m, 1 H) 4.23-4.37(m, 4 H). 4.5

(400 MHz, DMSO-d₆) 8.74(d, J = 2.35 Hz, 1 H) 8.68(d, J = 2.35 Hz, 1 H) 8.49(d, J = 2.35 Hz, 1 H) 8.25 (td, J = 8.12, 2.54 Hz, 1 H) 8.02(d, J = 8.61 Hz, 1 H) 7.70(d, J = 7.43 Hz, 1 H) 7.46-7.61(m, 2 H) 7.40(dd, J = 8.61, 2.74 Hz, 1 H) 7.14-7.27 (m, 1 H) 6.75(d, J = 8.61 Hz, 1 H) 4.37-4.49(m, 1 H) 4.23-4.37(m, 4 H). 4.6

(400 MHz, DMSO-d₆) 8.64(d, J = 2.35 Hz, 1 H) 8.60(d, J = 1.96 Hz, 1 H) 8.02(d, J = 9.00 Hz, 1 H) 7.78 (d, J = 8.22 Hz, 1 H) 7.70(d, J = 7.82 Hz, 1 H) 7.43-7.62(m, 2 H) 7.21(t, J = 7.04 Hz, 1 H) 6.76(d, J = 9.00 Hz, 1 H) 6.59(d, J = 8.22 Hz, 1 H) 4.31 (br. s., 1 H) 4.23(t, J = 6.65 Hz, 2 H) 4.00-4.14(m, 2 H) 3.97(s, 3 H) 3.94(s, 3 H). 4.7

(400 MHz, DMSO-d₆) 8.77(d, J = 2.3 Hz, 2 H), 8.70(d, J = 2.3 Hz, 1 H), 8.69(s, 1 H), 8.07-7.97(m, 2 H), 7.70(d, J = 8.2 Hz, 1 H), 7.59- 7.47(m, 2 H), 7.26-7.16(m, 1 H), 6.76(d, J = 9.0 Hz, 1 H), 4.50-4.40 (m, 1 H), 4.37-4.23(m, 4 H) 4.8

(500 MHz, DMSO-d₆) 8.68-8.79 (m, 2 H) 8.43(d, J = 2.29 Hz, 1 H) 8.38(d, J = 9.28 Hz, 1 H) 8.00(dd, J = 8.59, 2.41 Hz, 1 H) 7.93(d, J = 7.90 Hz, 1 H) 7.77(d, J = 3.55 Hz, 2 H) 7.49(dd, J = 8.08, 4.07 Hz, 1 H) 7.03(d, J = 8.59 Hz, 1 H) 7.05(d, J = 9.74 Hz, 1 H) 4.66(br. s., 2 H) 4.45-4.64(m, 2 H) 3.96(s, 3 H). 4.9

(500 MHz, DMSO-d₆) 8.78(d, J = 2.41 Hz, 1 H) 8.71-8.76(m, 1 H) 8.39(d, J = 9.51 Hz, 1 H) 8.30(s, 1 H) 8.11(d, J = 9.51 Hz, 1 H) 7.93(d, J = 7.90 Hz, 1 H) 7.78(d, J = 3.55 Hz, 2 H) 7.44-7.52(m, 1 H) 7.05(d, J = 9.28 Hz, 1 H) 4.52-4.72(m, 5 H) 2.37(s, 3 H). 4.10

(500 MHz, DMSO-d₆) 8.83(s, 1 H) 8.79(d, J = 2.29 Hz, 1 H) 8.76(s, 2 H) 8.39(d, J = 9.39 Hz, 1 H) 8.09(d, J = 7.90 Hz, 1 H) 7.93(d, J = 7.90 Hz, 1 H) 7.77(br. s., 2 H) 7.64(dd, J = 7.73, 4.75 Hz, 1 H) 7.50(d, J = 8.02 Hz, 1 H) 7.05(d, J = 9.39 Hz, 1 H) 4.67(br. s., 2 H) 4.60(br. s., 3 H). 4.11

(600 MHz, DMSO-d₆) 8.80(s, 1 H), 8.77-8.71(m, 1 H) , 8.37(d, J = 9.3 Hz, 1 H), 8.18-8.08(m, J = 8.1 Hz, 2 H), 7.92(d, J = 7.9 Hz, 1 H), 7.91- 7.87(m, J = 8.1 Hz, 2 H), 7.78(br. s., 2 H), 7.48(t, J = 5.7 Hz, 1 H), 7.02(d, J = 9.3 Hz, 1 H), 4.70-4.54 (m, 6 H) 4.12

(500 MHz, DMSO-d₆) 8.57(s, 2 H) 8.17(s, 1 H) 8.03(d, J = 9.05 Hz, 1 H) 7.70(d, J = 7.90 Hz, 1 H) 7.65 (dd, J = 8.59, 2.29 Hz, 1 H) 7.57(d, J = 8.36 Hz, 1 H) 7.52(t, J = 7.56 Hz, 1 H) 7.21(t, J = 7.33 Hz, 1 H) 6.76 (d, J = 8.94 Hz, 1 H) 6.60(d, J = 8.59 Hz, 1 H) 6.35(s, 2 H) 4.47(q, J = 7.48 Hz, 1 H), 4.37(t, J = 8.08 Hz, 2 H) 4.22-4.30(m, 2 H). 4.13

(500 MHz, DMSO-d₆) 8.67(d, J = 2.29 Hz, 1 H) 8.63(d, J = 2.29 Hz, 1 H) 8.08(d, J = 2.52 Hz, 1 H) 8.02 (d, J = 8.94 Hz, 1 H) 7.89-7.96(m, 1 H) 7.70(d, J = 8.02 Hz, 1 H) 7.54- 7.63(m, 1 H) 7.45-7.54(m, 1 H) 7.21(t, J = 7.33 Hz, 1 H) 7.11(d, J = 1.95 Hz, 1 H) 6.75(d, J = 8.94 Hz, 1 H) 5.57(br. s., 1 H) 4.31-4.45(m, 3 H) 4.20-4.31(m, 2 H). 4.14

(500 MHz, DMSO-d₆) 8.72(d, J = 2.29 Hz, 1 H), 8.65(d, J = 2.29 Hz, 1 H) 8.01(d, J = 8.94 Hz, 1 H) 7.93 (t, J = 7.85 Hz, 1 H) 7.69(d, J = 7.90 Hz, 1 H) 7.63(d, J = 7.33 Hz, 1 H) 7.55(d, J = 8.48 Hz, 1 H) 7.51(t, J = 7.56 Hz, 1 H) 7.20(t, J = 7.27 Hz, 1 H) 6.98(d, J = 8.25 Hz, 1 H) 6.76 (d, J = 8.94 Hz, 1 H) 4.81-4.95(m, 1 H) 4.40(t, J = 8.25 Hz, 2 H) 4.21- 4.33(m, 2 H) 4.00(s, 3 H). 4.15

(400 MHz, CD₃OD) 8.94(d, J = 4.69 Hz, 1 H) 8.88(d, J = 2.35 Hz, 1 H) 8.72(d, J = 2.35 Hz, 1 H) 8.38(d, J = 9.39 Hz, 1 H) 8.06(d, J = 7.04 Hz, 1 H) 7.94(d, J = 7.82 Hz, 1 H) 7.90 (dd, J = 7.92, 4.79 Hz, 1 H) 7.75- 7.87(m, 2 H) 7.49-7.65(m, 1 H) 7.00(d, J = 9.39 Hz, 1 H) 4.62-4.84 (m, 4 H) 4.14(quin, J = 7.34 Hz, 1 H). 4.16

(400 MHz, CD₃OD) 8.67-8.70(m, 1 H) 8.65-8.67(m, 1 H) 8.63(s, 2 H) 8.38(d, J = 9.39 Hz, 1 H) 7.94(d, J = 7.63 Hz, 1 H) 7.75-7.88(m, 2 H) 7.51-7.61(m, 1 H) 7.02(d, J = 9.59 Hz, 1 H) 4.67-4.85(m, 5 H) 3.32 (s, 6 H). 4.17

(400 MHz, CD₃OD) 8.86(d, J = 2.35 Hz, 1 H) 8.76(d, J = 2.54 Hz, 1 H) 8.68(d, J = 5.28 Hz, 1 H) 8.55(s, 1 H) 8.38(d, J = 9.59 Hz, 1 H) 7.94(d, J = 8.02 Hz, 1 H) 7.75-7.89(m, 2 H) 7.70(d, J = 5.48 Hz, 1 H) 7.56(td, J = 7.48, 1.27 Hz, 1 H) 7.00(d, J = 9.39 Hz, 1 H) 4.75-4.83(m, 2 H) 4.63-4.75(m, 2 H) 4.19-4.37(m, 1 H) 2.34(s, 3 H). 4.18

(300 MHz, CD₃OD) 9.31(d, J = 2.19 Hz, 1 H) 9.16(d, J = 2.05 Hz, 1 H) 8.85(d, J = 2.34 Hz, 1 H) 8.78(d, J = 2.34 Hz, 1 H) 8.62(t, J = 2.12 Hz, 1 H) 8.38(d, J = 9.50 Hz, 1 H) 7.94 (d, J = 8.04 Hz, 1 H) 7.73-7.89(m, 2 H) 7.56(td, J = 7.38, 1.46 Hz, 1 H) 7.02(d, J = 9.35 Hz, 1 H) 4.76-4.84 (m, 4 H) 4.56-4.73(m, 1 H) 3.36 (s, 3 H). 4.19

(300 MHz, CD₃OD) 8.80(d, J = 2.48 Hz, 1 H) 8.73(d, J = 2.48 Hz, 1 H) 8.60-8.69(m, 2 H) 8.37(d, J = 9.35 Hz, 1 H) 8.01-8.11(m, 1 H) 7.93 (d, J = 7.89 Hz, 1 H) 7.72-7.89(m, 2 H) 7.48-7.62(m, 1 H) 7.00(d, J = 9.50 Hz, 1 H) 4.73-4.83(m, 4 H) 4.58-4.72(m, 1 H) 2.56(s, 3 H). 4.20

(300 MHz, CD₃OD) 8.80(d, J = 2.34 Hz, 1 H) 8.73(d, J = 2.48 Hz, 1 H) 8.48(d, J = 2.78 Hz, 1 H) 8.31-8.43 (m, 2 H) 7.93(d, J = 7.89 Hz, 1 H) 7.74-7.88(m, 2 H) 7.71(dd, J = 2.78, 1.75 Hz, 1 H) 7.55(ddd, J = 8.00, 6.76, 1.46 Hz, 1 H) 7.00(d, J = 9.50 Hz, 1 H) 4.73-4.82(m, 4 H) 4.60-4.73(m, 1 H) 4.03(s, 3 H). 4.21

(500 MHz, DMSO-d₆) 8.68(d, J = 2.41 Hz, 1H) 8.63(d, J = 2.41 Hz, 1 H) 8.01(d, J = 8.82 Hz, 1 H) 7.69 (d, J = 7.67 Hz, 1 H) 7.53-7.63(m, 3 H) 7.47-7.53(m, 1 H) 7.43(dd, J = 8.19, 2.00 Hz, 1 H) 7.14-7.26 (m, 1 H) 6.74(d, J = 8.94 Hz, 1 H) 4.36-4.46(m, 1 H) 4.32(t, J = 7.96 Hz, 2 H) 4.20-4.29(m, 2 H) 2.45 (s, 3 H). 4.22

(500 MHz, DMSO-d₆) 8.68(d, J = 2.41 Hz, 1 H) 8.63(d, J = 2.41 Hz, 1 H) 8.04(d, J = 8.82 Hz, 1 H) 7.71 (d, J = 7.68 Hz, 1 H) 7.50-7.62(m, 2 H) 7.48(t, J = 7.85 Hz, 1 H) 7.39(d, J = 10.65 Hz, 1 H) 7.33(dd, J = 7.73, 1.55 Hz, 1 H) 7.22(t, J = 7.39 Hz, 1 H) 6.76(d, J = 9.05 Hz, 1 H) 4.39- 4.51(m, 1 H) 4.21-4.39(m, 4 H) 2.35(s, 3 H). 4.23

(500 MHz, DMSO-d₆) 8.62(d, J = 2.41 Hz, 1 H) 8.59(d, J = 2.29 Hz, 1 H) 8.01(d, J = 8.82 Hz, 1 H) 7.70 (d, J = 7.22 Hz, 1 H) 7.59(d, J = 2.06 Hz, 1 H) 7.54-7.58(m, 1 H) 7.47- 7.54(m, 1 H) 7.39(dd, J = 8.42, 2.12 Hz, 1 H) 7.17-7.25(m, 1 H) 7.14 (d, J = 8.36 Hz, 1 H) 6.75(d, J = 8.82 Hz, 1 H) 4.40-4.51(m, 1 H) 4.33(t, J = 8.13 Hz, 2 H) 4.19-4.29(m, 2 H). 4.24

(500 MHz, DMSO-d₆) 8.73(d, J = 2.41 Hz, 1 H) 8.66(d, J = 2.41 Hz, 1 H) 8.02(d, J = 8.94 Hz, 1 H) 7.70 (d, J = 7.79 Hz, 1 H) 7.54-7.60(m, 1 H) 7.46-7.54(m, 2 H) 7.43(d, J = 9.39 Hz, 2 H) 7.14-7.28(m, 1 H) 6.75(d, J = 8.82 Hz, 1 H) 4.36-4.47 (m, 1 H) 4.24-4.36(m, 4 H) 3.94 (s, 3 H). 4.25

(500 MHz, DMSO-d₆) 8.64(d, J = 2.41 Hz, 1 H) 8.60(d, J = 2.41 Hz, 1 H) 8.01(d, J = 8.82 Hz, 1 H) 7.69 (d, J = 7.33 Hz, 1 H) 7.53-7.58(m, 1 H) 7.45-7.53(m, 2 H) 7.37(dd, J = 8.53, 1.78 Hz, 1 H) 7.31(t, J = 8.53 Hz, 1 H) 7.15-7.25(m, 1 H) 6.74 (d, J = 8.94 Hz, 1 H) 4.41-4.55(m, 1 H) 4.32(t, J = 8.13 Hz, 2 H) 4.13- 4.28(m, 4 H) 1.41(t, J = 6.99 Hz, 3 H). 4.26

(500 MHz, DMSO-d₆) 8.65(d, J = 2.41 Hz, 1 H) 8.61(d, J = 2.41 Hz, 1 H) 8.02(d, J = 8.93 Hz, 1 H) 7.70 (d, J = 7.56 Hz, 1 H) 7.68(d, J = 2.18 Hz, 1 H) 7.44-7.62(m, 3 H) 7.30 (d, J = 8.59 Hz, 1 H) 7.14-7.25(m, 1 H) 6.75(d, J = 8.94 Hz, 1 H) 4.39- 4.56(m, 1 H) 4.32(t, J = 8.13 Hz, 2 H) 4.06-4.29(m, 4 H) 1.42(t, J = 6.93 Hz, 3 H). 4.27

(500 MHz, DMSO-d₆) 8.65(d, J = 2.41 Hz, 1 H) 8.61(d, J = 2.41 Hz, 1 H) 8.02(d, J = 8.94 Hz, 1 H) 7.70 (d, J = 7.45 Hz, 1 H) 7.67(d, J = 2.18 Hz, 1 H) 7.46-7.61(m, 3 H) 7.30 (d, J = 8.59 Hz, 1 H) 7.16-7.25(m, 1 H) 6.75(d, J = 8.82 Hz, 1 H) 4.40- 4.52(m, 1 H) 4.32(t, J = 8.13 Hz, 2 H) 4.21-4.29(m, 2 H) 4.13(t, J = 6.42 Hz, 2 H) 1.82(sxt, J = 6.99 Hz, 2 H) 1.05(t, J = 7.39 Hz, 3 H). 4.28

(500 MHz, DMSO-d₆) 8.76(d, J = 2.41 Hz, 1 H) 8.68(d, J = 2.29 Hz, 1 H) 8.02(d, J = 8.82 Hz, 1 H) 7.88 (d, J = 8.59 Hz, 1 H) 7.77-7.85(m, 2 H) 7.70(d, J = 7.90 Hz, 1 H) 7.54- 7.61(m, 1 H) 7.44-7.54(m, 1 H) 7.12-7.29(m, 1 H) 6.75(d, J = 8.82 Hz, 1 H) 4.42(quin, J = 7.25 Hz, 1 H) 4.30(d, J = 7.22 Hz, 4 H). 4.29

(500 MHz, DMSO-d₆) 8.59-8.63 (m, 1 H) 8.54-8.59(m, 1 H) 8.01 (d, J = 8.93 Hz, 1 H) 7.69(d, J = 7.68 Hz, 1 H) 7.53-7.59(m, 1 H) 7.47- 7.53(m, 1 H) 7.33-7.46(m, 2 H) 7.14-7.28(m, 1 H) 7.10(d, J = 8.36 Hz, 1 H) 6.74(d, J = 8.94 Hz, 1 H) 4.39-4.52(m, 1 H) 4.33(t, J = 8.13 Hz, 2H) 4.18-4.29(m, 2 H) 3.88 (s, 3 H) 2.26(s, 3 H). 4.30

(500 MHz, DMSO-d₆) 8.70(d, J = 2.41 Hz, 1 H) 8.63(d, J = 2.41 Hz, 1 H) 8.02(d, J = 8.93 Hz, 1 H) 7.70 (d, J = 7.67 Hz, 1 H) 7.48-7.60(m, 2 H) 7.10-7.31(m, 1 H) 6.85-7.06 (m, 3 H) 6.75(d, J = 8.82 Hz, 1 H) 4.75(dt, J = 12.03, 6.01 Hz, 1 H) 4.36- 4.50(m, 1 H) 4.18-4.35(m, 4 H) 1.32(d, J = 5.97 Hz, 6 H). 4.31

(500 MHz, DMSO-d₆) 8.69(d, J = 2.41 Hz, 1 H) 8.63(d, J = 2.41 Hz, 1 H) 8.02(d, J = 8.94 Hz, 1 H) 7.70 (d, J = 7.56 Hz, 1 H) 7.54-7.58(m, 1 H) 7.48-7.54(m, 1 H) 7.14-7.31 (m, 4 H) 6.75(d, J = 8.82 Hz, 1 H) 4.37-4.50(m, 1 H) 4.20-4.36(m, 4 H) 2.44(s, 3 H). 4.32

(500 MHz, DMSO-d₆) 8.71(d, J = 2.41 Hz, 1 H) 8.64(d, J = 2.41 Hz, 1 H) 8.02(d, J = 8.93 Hz, 1 H) 7.80- 7.87(m, 1 H) 7.70(d, J = 7.67 Hz, 1 H) 7.54-7.65(m, 3 H) 7.48-7.54 (m, 1 H) 7.17-7.24(m, 1 H) 6.75 (d, J = 8.94 Hz, 1 H) 4.37-4.47(m, 1 H) 4.22-4.36(m, 4 H). 4.33

(500 MHz, DMSO-d₆) 8.70(d, J = 2.41 Hz, 1 H) 8.64(d, J = 2.41 Hz, 1 H) 8.01(d, J = 8.82 Hz, 1 H) 7.66- 7.74(m, 2 H) 7.58-7.66(m, 1 H) 7.53-7.58(m, 1 H) 7.48-7.53(m, 1 H) 7.41-7.48(m, 1 H) 7.12-7.26 (m, 1 H) 6.74(d, J = 8.94 Hz, 1 H) 4.38-4.48(m, 1 H) 4.31(t, J = 8.08 Hz, 2 H) 4.21-4.29(m, 2 H). 4.34

(500 MHz, DMSO-d₆) 8.72(d, J = 2.41 Hz, 1 H) 8.65(d, J = 2.41 Hz, 1 H) 8.02(d, J = 8.93 Hz, 1 H) 7.87 (d, J = 1.95 Hz, 1 H) 7.82(d, J = 8.25 Hz, 1 H) 7.70(d, J = 7.45 Hz, 1 H) 7.60(dd, J = 8.31, 2.00 Hz, 1 H) 7.54- 7.58(m, 1 H) 7.48-7.54(m, 1 H) 7.16-7.27(m, 1 H) 6.76(d, J = 8.82 Hz, 1 H) 4.37-4.47(m, 1 H) 4.32(t, J = 8.02 Hz, 2 H) 4.24-4.30(m, 2 H). 4.35

(500 MHz, DMSO-d₆) 8.63(d, J = 2.41 Hz, 1 H) 8.60(d, J = 2.41 Hz, 1 H) 8.02(d, J = 8.82 Hz, 1 H) 7.70 (d, J = 7.56 Hz, 1 H) 7.53-7.58(m, 1 H) 7.48-7.53(m, 1 H) 7.36(s, 1 H) 7.26-7.34(m, 2 H) 7.17-7.24(m, 1 H) 6.75(d, J = 8.94 Hz, 1 H) 4.36- 4.47(m, 1 H) 4.32(t, J = 8.02 Hz, 2 H) 4.21-4.29(m, 2 H) 2.34(s, 3 H) 2.33(s, 3 H). 4.36

(500 MHz, DMSO-d₆) 8.68(d, J = 2.29 Hz, 1 H) 8.63(d, J = 2.41 Hz, 1 H) 8.01(d, J = 8.82 Hz, 1 H) 7.69 (d, J = 7.56 Hz, 1 H) 7.64(d, J = 1.49 Hz, 1 H) 7.48-7.59(m, 3 H) 7.46 (dd, J = 7.79, 1.60 Hz, 1 H) 7.13- 7.28(m, 1 H) 6.75(d, J = 8.82 Hz, 1 H) 4.37-4.48(m, 1 H) 4.19-4.36 (m, 4 H) 2.44(s, 3 H). 4.37

(500 MHz, DMSO-d₆) 8.70(d, J = 2.41 Hz, 1 H) 8.63(d, J = 2.41 Hz, 1 H) 8.02(d, J = 8.82 Hz, 1 H) 7.70 (d, J = 7.67 Hz, 1 H) 7.54-7.59(m, 1 H) 7.49-7.54(m, 1 H) 7.45(s, 2 H) 7.35(s, 1 H) 7.12-7.27(m, 1 H) 6.76(d, J = 8.82 Hz, 1 H) 4.36-4.47 (m, 1 H) 4.20-4.36(m, 4 H) 2.44 (s, 3 H). 4.38

(500 MHz, DMSO-d₆) 8.66(d, J = 2.41 Hz, 1 H) 8.61(d, J = 2.41 Hz, 1 H) 8.01(d, J = 8.94 Hz, 1 H) 7.70 (d, J = 7.56 Hz, 1 H) 7.54-7.58(m, 1 H) 7.48-7.54(m, 2 H) 7.41-7.47 (m, 1 H) 7.31(t, J = 9.11 Hz, 1 H) 7.17-7.25(m, 1 H) 6.74(d, J = 8.82 Hz, 1 H) 4.37-4.45(m, 1 H) 4.32(t, J = 8.02 Hz, 2 H) 4.21-4.29(m, 2 H) 2.26-2.42(m, 3 H). 4.39

(500 MHz, DMSO-d₆) 9.36(s, 1 H) 9.08(s, 2 H) 8.78(d, J = 2.41 Hz, 1 H) 8.73(d, J = 2.29 Hz, 1 H) 8.03(d, J = 8.82 Hz, 1 H) 7.71(d, J = 8.02 Hz, 1 H) 7.48-7.60(m, 2 H) 7.22(t, J = 7.33 Hz, 1 H) 6.76(d, J = 8.82 Hz, 1 H) 4.41-4.52(m, 1 H) 4.23-4.39 (m, 4 H). 4.40

(500 MHz, DMSO-d₆) 8.74(d, J = 2.41 Hz, 1 H) 8.67(d, J = 2.41 Hz, 1 H) 8.06(s, 1 H) 8.02(d, J = 8.94 Hz, 1 H) 7.93(s, 2 H) 7.70(d, J = 7.67 Hz, 1 H) 7.54-7.60(m, 1 H) 7.48-7.54(m, 1 H) 7.16-7.27(m, 1 H) 6.76(d, J = 8.94 Hz, 1 H) 4.36- 4.45(m, 1 H) 4.26-4.36(m, 4 H). 4.41

(300 MHz, MeOH) 8.57(1 H, d, J = 2.5 Hz), 8.48(1 H, d, J = 2.3 Hz), 8.03(1 H, d, J = 9.1 Hz), 7.70(2 H, m), 7.54(1 H, m), 7.23-7.30(1 H, m), 6.78(1 H, d, J = 8.9 Hz), 5.99(1 H, br. s.), 4.38-4.66(3 H, m), 4.02 (4 H, m), 3.32-3.37(2 H, m), 2.61 (2H, m) 4.42

(300 MHz, MeOH) 8.57(1 H, d, J = 2.3 Hz), 8.48(1 H, d, J = 2.5 Hz), 8.04(1 H, d, J = 8.9 Hz), 7.71(2 H, d, J = 7.7 Hz), 7.58(1 H, t, J = 7.7 Hz), 7.22-7.34(1 H, m), 6.79(1 H, d, J = 8.9 Hz), 5.99(1 H, s), 4.50-4.70 (3 H, m), 4.39-4.50(3 H, m), 2.46- 2.48(2 H, m), 1.45(1 H, s), 1.39(6 H, s) 4.43

(300 MHz, DMSO-d₆) 13.31(1 H, br. s.), 8.50(1 H, d, J = 2.2 Hz), 8.54 (1 H, d, J = 2.3 Hz), 8.29(1 H, s), 7.97-8.08(2 H, m), 7.71(1 H, d, J =7.9 Hz), 7.47-7.61(2 H, m), 7.22 (1 H, t, J = 6.7 Hz), 6.79(1 H, d, J = 8.9 Hz), 4.42-4.71(3 H, m), 4.21- 4.42(2 H, m) 4.44

(500 MHz, DMSO-d₆) 8.76(d, J = 2.41 Hz, 1 H) 8.68(d, J = 2.29 Hz, 1 H) 8.02(d, J = 8.82 Hz, 1 H) 7.88 (d, J = 8.59 Hz, 1 H) 7.77-7.85(m, 2 H) 7.70(d, J = 7.90 Hz, 1 H) 7.54- 7.61(m, 1 H) 7.44-7.54(m ,1 H) 7.12-7.29(m, 1H) 6.75(d, J = 8.82 Hz, 1 H) 4.42(quin, J = 7.25 Hz, 1 H) 4.30(d, J = 7.22 Hz, 4 H). 4.45

(500 MHz, DMSO-d₆) 8.72(d, J = 2.29 Hz, 1 H) 8.65(d, J = 2.29 Hz, 1 H) 8.01(d, J = 8.94 Hz, 1 H) 7.93 (t, J = 7.85 Hz, 1 H) 7.69(d, J = 7.90 Hz, 1 H) 7.63(d, J = 7.33 Hz, 1 H) 7.55(d, J = 8.48 Hz, 1 H) 7.51(t, J = 7.56 Hz, 1 H) 7.20(t, J = 7.27 Hz, 1 H) 6.98(d, J = 8.25 Hz, 1 H) 6.76 (d, J = 8.94 Hz, 1 H) 4.81-4.95(m, 1 H) 4.40(t, J = 8.25 Hz, 2 H) 4.21- 4.33(m, 2 H) 4.00(s, 3 H).

Example 5.1 2-(3-(3-phenylpyrazin-2-yl)azetidin-1-yl)quinoline

A glass microwave reaction vessel was charged with 2-(3-(3-chloropyrazin-2-yl)azetidin-1-yl)quinoline (0.085 g, 0.286 mmol), phenylboronic acid (0.070 g, 0.573 mmol, Aldrich), potassium phosphate (0.152 g, 0.716 mmol, Alfa Aesar), bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium (II) (0.020 g, 0.029 mmol, Aldrich), water (0.400 mL) and dioxane (1.6 mL). The mixture was purged with Argon gas and heated in an Initiator microwave reactor (Personal Chemistry, Biotage AB, Inc., Upssala, Sweden) at 100° C. for 30 min. LCMS showed the product. The mixture was diluted with EtOAc and washed with Na₂CO₃ and brine. The organic layer was dried over Na₂SO₄ and concentrated in vacuo. The crude was purified by silica gel chromatography (12 g, 10%-100% EtOAc-Hexane). The product was obtained as a white solid (85 mg, 88%).

The following Table 17A lists compounds of Examples 5.1 to 5.43, which were made analogous to Scheme 5 by using the appropriate materials and reaction conditions, which are listed in Table 17B. The NMR data of the Examples are listed in Table 17C.

TABLE 17A EXAMPLES 5.1 TO 5.43 ESI-MS Ex. # Structure Chemical Name (M + 1) IC₅₀ (μM) 5.1

2-(3-(3-phenylpyrazin-2- yl)azetidin-1-yl)quinoline 339 0.0012 5.2

2-(3-(3-(4- methoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 369 0.002 5.3

2-(3-(3-(4- fluorophenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 357 0.002 5.4

2-(3-(3-(2- fluorophenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 357 0.01 5.5

2-(3-(3-(3- fluorophenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 357 0.004 5.6

2-(3-(3-(pyridin-4- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 340 0.004 5.7

3-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)benzonitrile 364 0.003 5.8

4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)benzonitrile 364 0.003 5.9

methyl 3-(3-(1-(quinolin- 2-yl)azetidin-3-yl)pyrazin- 2-yl)benzoate 397 0.0002 5.10

ethyl 4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)benzoate 411 0.002 5.11

2-(3-(3-(2- methoxypyridin-4- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 370 0.002 5.12

2-(3-(3-(2-fluoropyridin- 4-yl)pyrazin-2-yl)azetidin- 1-yl)quinoline 358 0.01 5.13

2-(3-(3-(3- (methylthio)phenyl)pyrazin- 2-yl)azetidin-1- yl)quinoline 385 0.004 5.14

1-(4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)phenyl)ethanone 381 0.003 5.15

2-(3-(3-(4- phenoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 431 0.034 5.16

2-(3-(3-(4- (trifluoromethyl)phenyl)py- razin-2-yl)azetidin-1- yl)quinoline 407 0.027 5.17

2-(3-(3-(3-fluoro-4- methoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 387 0.003 5.18

N,N-dimethyl-3-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)aniline 382 0.002 5.19

N-methyl-3-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)benzamide 396 0.0007 5.20

tert-butyl 4-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)-5,6- dihydropyridine-1(2H)- carboxylate 444 0.0007 5.21

2-(3-(3-([1,1′-biphenyl]-3- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 415 0.002 5.22

2-fluoro-4-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2- yl)benzonitrile 382 0.006 5.23

2-fluoro-5-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2- yl)benzonitrile 382 0.007 5.24

N,N-dimethyl-3-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)benzamide 410 0.018 5.25

2-(3-(3-(2- methoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 369 0.002 5.26

2-(3-(3-(3- (trifluoromethyl)phenyl)py- razin-2-yl)azetidin-1- yl)quinoline 407 0.01344 5.27

2-(3-(3-(3- ethoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 383 0.00388 5.28

1-(3-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)phenyl)ethanone 381 0.00124 5.29

(3-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)phenyl)methanol 369 0.00676 5.30

2-(3-(3-(3- (trifluoromethoxy)phenyl) pyrazin-2-yl)azetidin-1- yl)quinoline 423 0.00665 5.31

2-(3-(3-(3- (benzyloxy)phenyl)pyrazin- 2-yl)azetidin-1- yl)quinoline 445 0.01077 5.32

N-cyclopropyl-3-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)benzamide 422 0.00337 5.33

N,N-dimethyl-3-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2- yl)benzenesulfonamide 446 0.01703 5.34

2-(3-(3-(4- ethoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 383 0.01717 5.35

(4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)phenyl)methanol 369 0.00519 5.36

2-(3-(3-(4- propylphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 381 0.00995 5.37

2-(3-(3-(4- ethylphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 367 0.00609 5.38

N,N-dimethyl-4-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)aniline 382 0.01217 5.39

2-(3-(3-(4- (trifluoromethoxy)phenyl) pyrazin-2-yl)azetidin-1- yl)quinoline 423 0.01747 5.40

2-(3-(3-(4- isopropoxyphenyl)pyrazin- 2-yl)azetidin-1- yl)quinoline 397 0.00723 5.41

2-methyl-2-(4-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2- yl)phenyl)propanenitrile 406 0.00737 5.42

4-((4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)phenyl)sulfonyl)morpho- line 488 0.03337 5.43

2-(3-(3-(4-(piperidin-1- ylsulfonyl)phenyl)pyrazin- 2-yl)azetidin-1- yl)quinoline 486 0.02119

TABLE 17B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 5.1 TO 5.43. Unless otherwise stated, all starting materials are commercially available from common vendors. Reaction Purification EX # Key Starting Material(s) Key Starting Material(s) Condition Method* 5.1

Dioxane/water, 100° C., μW A 5.2

Dioxane/water, 100° C., μW A 5.3

Dioxane/water, 100° C., μW A 5.4

Dioxane/water, 100° C., μW A 5.5

Dioxane/water, 100° C., μW A 5.6

Dioxane/water, 100° C., μW B 5.7

Dioxane/water, 100° C., μW A 5.8

Dioxane/water, 100° C., μW A 5.9

Dioxane/water, 100° C., μW A 5.10

Dioxane/water, 100° C., μW A 5.11

Dioxane/water, 100° C., μW C 5.12

Dioxane/water, 100° C., μW C 5.13

Dioxane/water, 100° C., μW A 5.14

Dioxane/water, 100° C., μW A 5.15

Dioxane/water, 100° C., μW A 5.16

Dioxane/water, 100° C. A 5.17

Dioxane/water, 100° C. A 5.18

Dioxane/water, 100° C. A 5.19

Dioxane/water, 100° C. A 5.20

Dioxane/water, 100° C. A 5.21

Dioxane/water, 100° C. A 5.22

Dioxane/water, 100° C. A 5.23

Dioxane/water, 100° C. A 5.24

Dioxane/water, 100° C. C 5.25

Dioxane/water, 100° C. A 5.26

Dioxane/water, 100° C. D 5.27

Dioxane/water, 100° C. D 5.28

Dioxane/water, 100° C. D 5.29

Dioxane/water, 100° C. D 5.30

Dioxane/water, 100° C. D 5.31

Dioxane/water, 100° C. D 5.32

Dioxane/water, 100° C. D 5.33

Dioxane/water, 100° C. D 5.34

Dioxane/water, 100° C. D 5.35

Dioxane/water, 100° C. D 5.36

Dioxane/water, 100° C. D 5.37

Dioxane/water, 100° C. D 5.38

Dioxane/water, 100° C. D 5.39

Dioxane/water, 100° C. D 5.40

Dioxane/water, 100° C. D 5.41

Dioxane/water, 100° C. D 5.42

Dioxane/water, 100° C. D 5.43

Dioxane/water, 100° C. D *PURIFICATION CONDITIONS: METHOD A- purification by silica gel chromatography: (ISCO 12 g RediSep-silica column, eluting with a gradient of 10% to 100% EtOAc in hexane). METHOD B- purification by silica gel chromatography: (ISCO 12 g RediSep-silica column, eluting with a gradient of 0% to 10% MeOH in CH₂Cl₂). METHOD C- reverse-phase HPLC (Shimazu; Gemini 10 μM C18 110A AXIA, 100 × 50 mm column) eluting with 0.1% TFA- H₂O:0.1% TFA CH₃CN (10% → 55%). The fractions containing the desired product were combined, neutralized with Na₂CO₃, and extracted with a mixed solvent of CHCl₃:i-PrOH(3:1) three times. The organic phse was dried over Na₂SO₄ and concentrated in vacuo. METHOD D- reverse phse purification using the following conditions: (Instrumentation: MS - Waters SQ; UV - Waters 2487 or Waters PD; Solvents: A: Water w/ 0.1% NH₄OH B: Acetonitrile w/ 0.1% NH₄OH; Column: Phenomenex Gemini-NX C18 100A 5 um 21 × 100; Flow Rate: 44 mL/min. 10 min Method, variable gradient over 8 min).

TABLE 17C 1H NMR δ (PPM) DATA FOR EXAMPLES 5.1 TO 5.43 Ex. # Structure NMR 5.1

(400 MHz, CHLOROFORM-d) 4.32-4.53 (m, 5 H) 6.61 (d, J = 9.00 Hz, 1 H) 7.18-7.23 (m, 1 H) 7.46- 7.55 (m, 6 H) 7.59 (d, J = 8.02 Hz, 1 H) 7.72 (d, J = 8.41 Hz, 1 H) 7.85 (d, J = 9.00 Hz, 1 H) 8.55 (dd, J = 15.16, 2.45 Hz, 2 H). 5.2

(400 MHz, CHLOROFORM-d) 3.90 (s, 3 H) 4.38- 4.52 (m, 5 H) 6.62 (d, J = 8.80 Hz, 1 H) 7.04 (d, J = 8.61 Hz, 2 H) 7.21 (t, J = 7.43 Hz, 1 H) 7.44-7.55 (m, 3 H) 7.60 (d, J = 7.83 Hz, 1 H) 7.72 (d, J = 8.41 Hz, 1 H) 7.86 (d, J = 8.80 Hz, 1 H) 8.49-8.55 (m, 2 H). 5.3

(400 MHz, CHLOROFORM-d) 4.30-4.53 (m, 5 H) 6.63 (d, J = 8.80 Hz, 1 H) 7.18-7.25 (m, 3 H) 7.49- 7.56 (m, 3 H) 7.60 (d, J = 8.02 Hz, 1 H) 7.72 (d, J = 8.41 Hz, 1 H) 7.87 (d, J = 8.80 Hz, 1 H) 8.47-8.63 (m, 2 H). 5.4

(400 MHz, CHLOROFORM-d) 4.12-4.25 (m, 1 H) 4.34-4.49 (m, 4 H) 6.62 (d, J = 8.80 Hz, 1 H) 7.16- 7.25 (m, 2 H) 7.30-7.38 (m, 1 H) 7.45-7.56 (m, 3 H) 7.59 (d, J = 8.02 Hz, 1 H) 7.72 (d, J = 8.41 Hz, 1 H) 7.86 (d, J = 8.80 Hz, 1 H) 8.57 (d, J = 2.54 Hz, 1 H) 8.64 (d, J = 2.54 Hz, 1 H). 5.5

(400 MHz, CHLOROFORM-d) 4.32-4.54 (m, 5 H) 6.63 (d, J = 9.00 Hz, 1 H) 7.16-7.33 (m, 4 H) 7.45-7.57 (m, 2 H) 7.60 (d, J = 7.82 Hz, 1 H) 7.72 (d, J = 8.41 Hz, 1 H) 7.87 (d, J = 9.00 Hz, 1 H) 8.54 (d, J = 2.35 Hz, 1 H) 8.61 (d, J = 2.35 Hz, 1 H). 5.6

(400 MHz, CHLOROFORM-d) 4.30-4.39 (m, 1 H) 4.41-4.52 (m, 4 H) 6.63 (d, J = 8.80 Hz, 1 H) 7.23 (t, J = 7.53 Hz, 1 H) 7.44-7.49 (m, 2 H) 7.51-7.57 (m, 1 H) 7.61 (d, J = 7.82 Hz, 1 H) 7.73 (d, J = 8.41 Hz, 1 H) 7.88 (d, J = 8.80 Hz, 1 H) 8.58 (d, J = 2.35 Hz, 1 H) 8.66 (d, J = 2.35 Hz, 1 H) 8.78-8.83 (m, 2 H). 5.7

(400 MHz, CHLOROFORM-d) 4.28-4.38 (m, 1 H) 4.40-4.51 (m, 4 H) 6.64 (d, J = 8.80 Hz, 1 H) 7.20- 7.25 (m, 1 H) 7.50-7.57 (m, 1 H) 7.59-7.84 (m, 5 H) 7.85-7.92 (m, 2 H) 8.57 (d, J = 2.35 Hz, 1 H) 8.65 (d, J = 2.35 Hz, 1 H). 5.8

(400 MHz, CHLOROFORM-d) 4.28-4.37 (m, 1 H) 4.39-4.50 (m, 4 H) 6.63 (d, J = 8.80 Hz, 1 H) 7.19-7.25 (m, 1 H) 7.50-7.57 (m, 1 H) 7.61 (d, J = 7.82 Hz, 1 H) 7.66 (d, J = 8.41 Hz, 2 H) 7.72 (d, J = 8.41 Hz, 1 H) 7.84 (d, J = 8.41 Hz, 2 H) 7.89 (d, J = 8.80 Hz, 1 H) 8.57 (d, J = 2.54 Hz, 1 H) 8.65 (d, J = 2.35 Hz, 1 H). 5.9

(400 MHz, CHLOROFORM-d) 3.97 (s, 3 H) 4.34- 4.60 (m, 5 H) 6.63 (d, J = 8.80 Hz, 1 H) 7.18-7.25 (m, 1 H) 7.49-7.57 (m, 1 H) 7.58-7.68 (m, 2 H) 7.69-7.80 (m, 2 H) 7.87 (d, J = 9.00 Hz, 1 H) 8.17- 8.24 (m, 2 H) 8.54-8.58 (m, 1 H) 8.61 (d, J = 2.35 Hz, 1 H). 5.10

¹H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.45 (t, J = 7.14 Hz, 3 H) 4.27-4.55 (m, 7 H) 6.62 (d, J = 8.80 Hz, 1 H) 7.17-7.24 (m, 1 H) 7.49-7.64 (m, 4 H) 7.72 (d, J = 8.22 Hz, 1 H) 7.87 (d, J = 9.00 Hz, 1 H) 8.21 (d, J = 8.41 Hz, 2 H) 8.56 (d, J = 2.35 Hz, 1 H) 8.62 (d, J = 2.35 Hz, 1 H). 5.11

(400 MHz, CHLOROFORM-d) 4.02 (s, 3 H) 4.29- 4.53 (m, 5 H) 6.63 (d, J = 9.00 Hz, 1 H) 6.87 (s, 1 H) 7.03 (dd, J = 5.28, 1.37 Hz, 1 H) 7.19-7.25 (m, 1 H) 7.50-7.56 (m, 1 H) 7.61 (d, J = 8.02 Hz, 1 H) 7.73 (d, J = 8.41 Hz, 1 H) 7.88 (d, J = 8.80 Hz, 1 H) 8.33 (d, J = 5.28 Hz, 1 H) 8.56 (d, J = 2.35 Hz, 1 H) 8.64 (d, J = 2.35 Hz, 1 H). 5.12

(400 MHz, CHLOROFORM-d) 4.28-4.39 (m, 1 H) 4.41-4.53 (m, 4 H) 6.64 (d, J = 8.80 Hz, 1 H) 7.14 (s, 1 H) 7.20-7.26 (m, 1 H) 7.35 (d, J = 5.09 Hz, 1 H) 7.51-7.57 (m, 1 H) 7.61 (d, J = 7.82 Hz, 1 H) 7.73 (d, J = 8.41 Hz, 1 H) 7.90 (d, J = 8.80 Hz, 1 H) 8.41 (d, J = 5.28 Hz, 1 H) 8.59 (d, J = 2.35 Hz, 1 H) 8.69 (d, J = 2.35 Hz, 1 H). 5.13

(400 MHz, CHLOROFORM-d) 2.55 (s, 3 H) 4.34- 4.52 (m, 5 H) 6.63 (d, J = 8.80 Hz, 1 H) 7.18-7.25 (m, 2 H) 7.35-7.47 (m, 3 H) 7.50-7.56 (m, 1 H) 7.60 (d, J = 7.82 Hz, 1 H) 7.72 (d, J = 8.41 Hz, 1 H) 7.87 (d, J = 9.00 Hz, 1 H) 8.54 (d, J = 2.35 Hz, 1 H) 8.59 (d, J = 2.35 Hz, 1 H). 5.14

(400 MHz, CHLOROFORM-d) 2.69 (s, 3 H) 4.30- 4.54 (m, 5 H) 6.62 (d, J = 8.80 Hz, 1 H) 7.22 (t, J = 7.43 Hz, 1 H) 7.50-7.56 (m, 1 H) 7.60 (d, J = 8.02 Hz, 1 H) 7.64 (d, J = 8.41 Hz, 2 H) 7.72 (d, J = 8.41 Hz, 1 H) 7.87 (d, J = 8.80 Hz, 1 H) 8.12 (d, J = 8.41 Hz, 2 H) 8.57 (d, J = 2.35 Hz, 1 H) 8.62 (d, J = 2.35 Hz, 1 H). 5.15

(400 MHz, CHLOROFORM-d) 4.38-4.54 (m, 5 H) 6.63 (d, J = 8.80 Hz, 1 H) 7.08-7.24 (m, 6 H) 7.36- 7.44 (m, 2 H) 7.46-7.56 (m, 3 H) 7.60 (d, J = 8.02 Hz, 1 H) 7.72 (d, J = 8.41 Hz, 1 H) 7.87 (d, J = 8.80 Hz, 1 H) 8.52 (d, J = 2.35 Hz, 1 H) 8.56 (d, J = 2.35 Hz, 1 H). 5.16

(400 MHz, CHLOROFORM-d) 4.28-4.56 (m, 5 H) 6.63 (d, J = 9.00 Hz, 1 H) 7.19-7.25 (m, 1 H) 7.54 (t, J = 7.63 Hz, 1 H) 7.61 (d, J = 8.02 Hz, 1 H) 7.66 (d, J = 8.02 Hz, 2 H) 7.73 (d, J = 8.41 Hz, 1 H) 7.80 (d, J = 8.22 Hz, 2 H) 7.88 (d, J = 8.80 Hz, 1 H) 8.57 (d, J = 2.35 Hz, 1 H) 8.64 (d, J = 2.35 Hz, 1 H). 5.17

(400 MHz, CHLOROFORM-d) 3.99 (s, 3 H) 4.38- 4.51 (m, 5 H) 6.63 (d, J = 8.80 Hz, 1 H) 7.05-7.14 (m, 1 H) 7.18-7.25 (m, 2 H) 7.33 (dd, J = 11.74, 1.96 Hz, 1 H) 7.53 (t, J = 7.63 Hz, 1 H) 7.60 (d, J = 8.02 Hz, 1 H) 7.72 (d, J = 8.41 Hz, 1 H) 7.88 (d, J = 8.80 Hz, 1 H) 8.52 (d, J = 2.15 Hz, 1 H) 8.56 (d, J = 2.35 Hz, 1 H). 5.18

(400 MHz, CHLOROFORM-d) 3.03 (s, 6 H) 4.34- 4.55 (m, 5 H) 6.63 (d, J = 8.80 Hz, 1 H) 6.76-6.88 (m, 3 H) 7.18-7.24 (m, 1 H) 7.36 (t, J = 7.92 Hz, 1 H) 7.49-7.56 (m, 1 H) 7.60 (d, J = 7.82 Hz, 1 H) 7.72 (d, J = 8.41 Hz, 1 H) 7.86 (d, J = 9.00 Hz, 1 H) 8.52 (d, J = 2.35 Hz, 1 H) 8.56 (d, J = 2.35 Hz, 1 H). 5.19

(400 MHz, CHLOROFORM-d) 3.06 (d, J = 4.89 Hz, 3 H) 4.32-4.53 (m, 5 H) 6.27 (br. s., 1 H) 6.62 (d, J = 9.00 Hz, 1 H) 7.22 (t, J = 7.43 Hz, 1 H) 7.48-7.78 (m, 5 H) 7.83-8.06 (m, 3H) 8.55 (d, J = 2.35 Hz, 1 H) 8.61 (d, J = 2.35 Hz, 1 H). 5.20

(400 MHz, DMSO-d₆) 1.46 (s, 9 H) 3.31 (br. s., 2 H) 3.59 (t, J = 5.28 Hz, 2 H) 4.08 (br. s., 2 H) 4.20-4.32 (m, 2 H) 4.38-4.59 (m, 3 H) 5.92 (br. s., 1 H) 6.78 (d, J = 9.00 Hz, 1 H) 7.21 (t, J = 6.75 Hz, 1 H) 7.46- 7.61 (m, 2 H) 7.71 (d, J = 7.82 Hz, 1 H) 8.04 (d, J = 8.80 Hz, 1 H) 8.52 (d, J = 2.35 Hz, 1 H) 8.56 (d, J = 2.35 Hz, 1 H). 5.21

(400 MHz, CHLOROFORM-d) 4.38-4.54 (m, 5 H) 6.63 (d, J = 9.00 Hz, 1 H) 7.19-7.24 (m, 1 H) 7.36- 7.42 (m, 1 H) 7.44-7.55 (m, 4 H) 7.57-7.63 (m, 2 H) 7.66 (d, J = 7.63 Hz, 2 H) 7.69-7.77 (m, 3 H) 7.87 (d, J = 8.80 Hz, 1 H) 8.56 (d, J = 2.54 Hz, 1 H) 8.60 (d, J = 2.35 Hz, 1 H). 5.22

(400 MHz, CHLOROFORM-d) 4.26-4.38 (m, 1 H) 4.41-4.54 (m, 4 H) 6.64 (d, J = 9.00 Hz, 1 H) 7.20- 7.25 (m, 1 H) 7.41-7.49 (m, 2 H) 7.51-7.58 (m, 1 H) 7.62 (d, J = 7.82 Hz, 1 H) 7.73 (d, J = 8.41 Hz, 1 H) 7.80 (t, J = 7.34 Hz, 1 H) 7.90 (d, J = 8.80 Hz, 1 H) 8.58 (d, J = 2.15 Hz, 1 H) 8.67 (d, J = 2.15 Hz, 1 H). 5.23

(400 MHz, CHLOROFORM-d) 4.26-4.37 (m, 1 H) 4.40-4.53 (m, 4 H) 6.65 (s, 1 H) 7.20-7.25 (m, 1 H) 7.40 (t, J = 8.51 Hz, 1 H) 7.51-7.58 (m, 1 H) 7.62 (d, J = 7.82 Hz, 1 H) 7.73 (d, J = 8.41 Hz, 1 H) 7.75- 7.81 (m, 1 H) 7.86 (dd, J = 5.97, 2.25 Hz, 1 H) 7.90 (d, J = 8.80 Hz, 1 H) 8.56 (d, J = 2.35 Hz, 1 H) 8.65 (d, J = 2.15 Hz, 1 H). 5.24

(400 MHz, CHLOROFORM-d) 2.98-3.22 (m, 6 H) 4.30-4.54 (m, 5 H) 6.63 (d, J = 8.80 Hz, 1 H) 7.22 (t, J = 7.14 Hz, 1 H) 7.49-7.64 (m, 6 H) 7.72 (d, J = 8.41 Hz, 1 H) 7.87 (d, J = 9.00 Hz, 1 H) 8.55 (d, J = 2.35 Hz, 1 H) 8.61 (d, J = 2.35 Hz, 1 H). 5.25

(400 MHz, CHLOROFORM-d) 3.82 (s, 3 H) 4.04- 4.56 (m, 5 H) 6.61 (d, J = 8.80 Hz, 1 H) 7.02 (d, J = 8.41 Hz, 1 H) 7.12 (t, J = 7.43 Hz, 1 H) 7.21 (t, J = 7.43 Hz, 1 H) 7.37 (dd, J = 7.53, 1.47 Hz, 1 H) 7.43-7.55 (m, 2 H) 7.59 (d, J = 7.82 Hz, 1 H) 7.72 (d, J = 8.41 Hz, 1 H) 7.85 (d, J = 8.80 Hz, 1 H) 8.53 (d, J = 2.54 Hz, 1 H) 8.58 (d, J = 2.35 Hz, 1 H). 5.26

(400 MHz, DMSO-d₆) 4.22-4.45 (m, 5 H) 6.76 (d, J = 8.61 Hz, 1 H) 7.22 (t, J = 6.85 Hz, 1 H) 7.46-7.60 (m, 2 H) 7.71 (d, J = 7.82 Hz, 1 H) 7.78-7.85 (m, 1 H) 7.89-7.98 (m, 3 H) 8.03 (d, J = 9.00 Hz, 1 H) 8.68 (d, J = 2.35 Hz, 1 H) 8.74 (d, J = 2.35 Hz, 1 H). 5.27

(400 MHz, DMSO-d₆) 1.37 (t, J = 6.85 Hz, 3 H) 4.12 (q, J = 7.04 Hz, 2 H) 4.23-4.52 (m, 5 H) 6.77 (d, J = 9.00 Hz, 1 H) 7.06-7.15 (m, 3 H) 7.19-7.27 (m, 1 H) 7.42-7.61 (m, 3 H) 7.71 (d, J = 7.82 Hz, 1 H) 8.04 (d, J = 8.61 Hz, 1 H) 8.63 (d, J = 2.35 Hz, 1 H) 8.68 (d, J = 2.35 Hz, 1 H). 5.28

(400 MHz, DMSO-d₆) 2.68 (s, 3 H) 4.23-4.47 (m, 5 H) 6.75 (d, J = 9.00 Hz, 1 H) 7.17-7.24 (m, 1 H) 7.47-7.59 (m, 2 H) 7.67-7.78 (m, 2 H) 7.87 (d, J = 7.43 Hz, 1 H) 8.02 (d, J = 9.00 Hz, 1 H) 8.09-8.16 (m, 2 H) 8.67 (d, J = 2.35 Hz, 1 H) 8.72 (d, J = 2.35 Hz, 1 H) 5.29

(400 MHz, DMSO-d₆) 4.20-4.45 (m, 5 H) 4.62 (d, J = 5.48 Hz, 2 H) 5.35 (t, J = 5.67 Hz, 1 H) 6.75 (d, J = 9.00 Hz, 1 H) 7.21 (t, J = 7.24 Hz, 1 H) 7.42-7.60 (m, 6 H) 7.70 (d, J = 8.22 Hz, 1 H) 8.03 (d, J = 8.61 Hz, 1 H) 8.63 (d, J = 2.35 Hz, 1 H) 8.67 (d, J = 2.35 Hz, 1 H). 5.30

(400 MHz, DMSO-d₆) 4.23-4.47 (m, 5 H) 6.76 (d, J = 9.00 Hz, 1 H) 7.23 (t, J = 7.24 Hz, 1 H) 7.48-7.66 (m, 5 H) 7.67-7.75 (m, 2 H) 8.01-8.09 (m, 1 H) 8.65-8.68 (m, 1 H) 8.71-8.75 (m, 1 H). 5.31

(400 MHz, DMSO-d₆) 4.15-4.44 (m, 5 H) 5.21 (s, 2 H) 6.73 (d, J = 9.00 Hz, 1 H) 7.11-7.25 (m, 4 H) 7.28-7.34 (m, 1 H) 7.41 (t, J = 7.63 Hz, 2 H) 7.45- 7.59 (m, 5 H) 7.70 (d, J = 7.82 Hz, 1 H) 8.02 (d, J = 9.00 Hz, 1 H) 8.63 (d, J = 2.35 Hz, 1 H) 8.67 (d, J = 2.35 Hz, 1 H) 5.32

(400 MHz, DMSO-d₆) 0.57-0.64 (m, 2 H) 0.69- 0.77 (m, 2 H) 2.89 (tq, J = 7.34, 3.98 Hz, 1 H) 4.22- 4.45 (m, 5 H) 6.75 (d, J = 9.00 Hz, 1 H) 7.21 (t, J = 7.43 Hz, 1 H) 7.47-7.59 (m, 2 H) 7.61-7.67 (m, 1 H) 7.72 (dd, J = 14.87, 7.82 Hz, 2 H) 7.93-8.08 (m, 3 H) 8.57 (d, J = 3.91 Hz, 1 H) 8.66 (d, J = 2.35 Hz, 1 H) 8.71 (d, J = 2.35 Hz, 1 H) 5.33

(400 MHz, DMSO-d₆) 2.70 (s, 6 H) 4.25-4.43 (m, 5 H) 6.72-6.78 (m, 1 H) 7.17-7.25 (m, 1 H) 7.47- 7.59 (m, 2 H) 7.70 (d, J = 7.82 Hz, 1 H) 7.82-7.88 (m, 1 H) 7.90-7.98 (m, 3 H) 8.03 (d, J = 8.61 Hz, 1 H) 8.68 (d, J = 2.35 Hz, 1 H) 8.74 (d, J = 2.74 Hz, 1 H) 5.34

(400 MHz, DMSO-d₆) 1.38 (t, J = 7.04 Hz, 3 H) 4.13 (q, J = 6.78 Hz, 2 H) 4.22-4.29 (m, 2 H) 4.35 (t, J = 8.02 Hz, 2 H) 4.41-4.51 (m, 1 H) 6.76 (d, J = 9.00 Hz, 1 H) 7.05-7.12 (m, 2 H) 7.19-7.25 (m, 1 H) 7.48-7.59 (m, 4 H) 7.71 (d, J = 7.82 Hz, 1 H) 8.04 (d, J = 9.00 Hz, 1 H) 8.59-8.61 (m, 1 H) 8.61-8.63 (m, 1 H) 5.35

(400 MHz, DMSO-d₆) 4.19-4.47 (m, 5 H) 4.62 (d, J = 5.87 Hz, 2 H) 5.33 (t, J = 5.67 Hz, 1 H) 6.75 (d, J = 9.00 Hz, 1 H) 7.21 (t, J = 7.04 Hz, 1 H) 7.47-7.59 (m, 6 H) 7.70 (d, J = 7.82 Hz, 1 H) 8.03 (d, J = 9.00 Hz, 1 H) 8.63 (d, J = 2.74 Hz, 1 H) 8.66 (d, J = 2.74 Hz, 1 H) 5.36

(400 MHz, DMSO-d₆) 0.95 (t, J = 7.43 Hz, 3 H) 1.67 (sxt, J = 7.43 Hz, 2 H) 2.66 (t, J = 7.63 Hz, 2 H) 4.23- 4.47 (m, 5 H) 6.76 (d, J = 9.00 Hz, 1 H) 7.20-7.26 (m, 1 H) 7.38 (d, J = 7.82 Hz, 2 H) 7.47-7.61 (m, 4 H) 7.72 (d, J = 7.43 Hz, 1 H) 8.05 (d, J = 9.00 Hz, 1 H) 8.62 (d, J = 2.35 Hz, 1 H) 8.65 (d, J = 2.35 Hz, 1 H) 5.37

(400 MHz, DMSO-d₆) 1.26 (t, J = 7.43 Hz, 3 H) 2.72 (q, J = 7.56 Hz, 2 H) 4.22-4.50 (m, 5 H) 6.76 (d, J = 9.00 Hz, 1 H) 7.18-7.27 (m, 1 H) 7.40 (d, J = 8.22 Hz, 2 H) 7.47-7.61 (m, 4 H) 7.71 (d, J = 7.82 Hz, 1 H) 8.04 (d, J = 9.00 Hz, 1 H) 8.62 (d, J = 2.35 Hz, 1 H) 8.65 (d, J = 2.74 Hz, 1 H) 5.38

(400 MHz, DMSO-d₆) 3.01 (s, 6 H) 4.17-4.55 (m, 5 H) 6.76 (d, J = 9.00 Hz, 1 H) 6.86 (d, J = 9.00 Hz, 2 H) 7.16-7.25 (m, 1 H) 7.42-7.61 (m, 4 H) 7.70 (d, J = 7.43 Hz, 1 H) 8.02 (d, J = 9.00 Hz, 1 H) 8.51-8.58 (m, 2 H) 5.39

(400 MHz, DMSO-d₆) 4.28-4.48 (m, 5 H) 6.80 (d, J = 9.00 Hz, 1 H) 7.22-7.30 (m, 1 H) 7.52-7.62 (m, 4 H) 7.74 (d, J = 9.00 Hz, 3 H) 8.09 (d, J = 8.61 Hz, 1 H) 8.66 (d, J = 2.35 Hz, 1 H) 8.72 (d, J = 2.35 Hz, 1 H) 5.40

(400 MHz, DMSO-d₆) 1.33 (d, J = 6.26 Hz, 6 H) 4.20-4.52 (m, 5 H) 4.73 (dt, J = 12.03, 5.92 Hz, 1 H) 6.78 (d, J = 9.00 Hz, 1 H) 7.08 (d, J = 8.61 Hz, 2 H) 7.24 (t, J = 6.85 Hz, 1 H) 7.46-7.62 (m, 4 H) 7.72 (d, J = 8.22 Hz, 1 H) 8.06 (d, J = 9.00 Hz, 1 H) 8.59-8.61 (m, 1 H) 8.61-8.63 (m, 1 H) 5.41

(400 MHz, DMSO-d₆) 1.77 (s, 6 H) 4.23-4.46 (m, 5 H) 6.75 (d, J = 9.00 Hz, 1 H) 7.21 (t, J = 7.24 Hz, 1 H) 7.48-7.59 (m, 2 H) 7.62-7.76 (m, 5 H) 8.03 (d, J = 8.61 Hz, 1 H) 8.65 (d, J = 2.35 Hz, 1 H) 8.69 (d, J = 2.35 Hz, 1 H) 5.42

(400 MHz, DMSO-d₆) 2.89-3.02 (m, 4 H) 3.61- 3.75 (m, 4 H) 4.22-4.48 (m, 5 H) 6.74 (d, J = 8.61 Hz, 1 H) 7.17-7.24 (m, 1 H) 7.47-7.61 (m, 2 H) 7.70 (d, J = 7.82 Hz, 1 H) 7.84-7.97 (m, 4 H) 8.02 (d, J = 9.00 Hz, 1 H) 8.69 (d, J = 2.35 Hz, 1 H) 8.75 (d, J = 2.35 Hz, 1 H) 5.43

(400 MHz, DMSO-d₆) 1.41 (d, J = 3.91 Hz, 2 H) 1.57 (d, J = 4.69 Hz, 4 H) 2.99 (t, J = 5.28 Hz, 4 H) 4.20-4.47 (m, 5 H) 6.74 (d, J = 9.00 Hz, 1 H) 7.18- 7.25 (m, 1 H) 7.48-7.58 (m, 2 H) 7.70 (d, J = 7.82 Hz, 1 H) 7.81-7.88 (m, 2 H) 7.88-7.95 (m, 2 H) 8.02 (d, J = 9.00 Hz, 1 H) 8.68 (d, J = 2.35 Hz, 1 H) 8.74 (d, J = 2.35 Hz, 1 H)

Example 6.1 (R- & S-)-2-(3-(3-(3-(pyridin-3-yl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline

To a 3 mL vial was added 2-(3-(3-chloropyrazin-2-yl)azetidin-1-yl)quinoline (0.04000 g, 0.135 mmol), 3-(pyrrolidin-3-yl)pyridine (commerically available at Array Biopharma, 0.040 g, 0.270 mmol), and triethylamine (commerically available at Sigma Aldrich, 0.038 ml, 0.270 mmol) in DMSO (Solvent Volume: 0.449 ml) and the reaction was stirred at 110° C. overnight. Upon completion, the reaction was filtered into a 24 well plate and purified by reverse phase purification using the following conditions: (Instrumentation: MS—Waters SQ; UV—Waters 2487 or Waters PD; Solvents: A: Water w/0.1% NH₄OH B: Acetonitrile w/0.1% NH₄OH; Column: Phenomenex Gemini-NX C18 110A 5 um 21×100; Flow Rate: 44 mL/min. 10 min Method, variable gradient over 8 mins.)

The following Table 18A lists compounds of Examples 6.1 to 6.60, which were made analogous to Scheme 6 by using the appropriate materials and reaction conditions, which are listed in Table 18B. The NMR data of the Examples are listed in Table 18C.

TABLE 18A EXAMPLES 6.1 TO 6.60 ESI-MS Ex. # Structure Chemical Name (M + 1) IC₅₀ (μM) 6.1

(R- & S-)-2-(3-(3-(3-(pyridin- 3-yl)pyrrolidin-1-yl)pyrazin-2- yl)azetidin-1-yl)quinoline 409.0 0.001 6.2

(R- & S)-2-(3-(3-(3- phenethylpyrrolidin-1- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 436 0.010 6.3

(R- & S-)-2-(3-(3-(3- benzylpyrrolidin-1-yl)pyrazin- 2-yl)azetidin-1-yl)quinoline 422 0.005 6.4

(R)-N,N-dimethyl-1-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-3- amine 375 0.097 6.5

(R- & S-)-tert-butyl methyl(1- (3-(1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-3- yl)carbamate 461 0.002 6.6

(R- & S-)-N,N-dimethyl-1-(3- (1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-3- amine 375 0.061 6.7

2-(3-(3-(3- azabicyclo[3.1.0]hexan-3- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 344 0.003 6.8

(R- & S-)-2-(3-(3-(3- (phenylsulfonyl)pyrrolidin-1- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 472 0.008 6.9

(R- & S-)-3-methyl-5-(1-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-3- yl)-1,2,4-oxadiazole 414 0.001 6.10

(R)-1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)pyrrolidin-3-ol 348 0.007 6.11

(R- & S-)-2-(3-(3-(3-(pyridin- 4-yl)pyrrolidin-1-yl)pyrazin-2- yl)azetidin-1-yl)quinoline 409 0.001 6.12

2-(3-(3-(pyrrolidin-1- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 332 0.003 6.13

(3aR,6aS)-tert-butyl 5-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2- yl)hexahydropyrrolo[3,4- c]pyrrole-2(1H)-carboxylate 473 0.001 6.14

tert-butyl 5-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)hexahydropyrrolo[3,4- c]pyrrole-2(1H)-carboxylate 473 0.003 6.15

tert-butyl 4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)- 1,4-diazepane-1-carboxylate 461.1 0.225 6.16

(R)-(1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)pyrrolidin-3-yl)methanol 362 0.006 6.17

(R- & S-)-2-(3-(3-(3- (methylsulfonyl)pyrrolidin-1- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 410 0.033 6.18

(S)-(1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)pyrrolidin-3-yl)methanol 362 0.006 6.19

(R)-tert-butyl 1-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-3- ylcarbamate 447.0 0.021 6.20

(S)-2-(3-(3-(3-fluoropyrrolidin- 1-yl)pyrazin-2-yl)azetidin-1- yl)quinoline 350.0 0.023 6.21

2-(3-(3-(3,3-difluoropyrrolidin- 1-yl)pyrazin-2-yl)azetidin-1- yl)quinoline 368 0.01575 6.22

2-(3-(3-(4-isopropyl-1,4- diazepan-1-yl)pyrazin-2- yl)azetidin-1-yl)quinoline 403 0.655 6.23

(1R,5R)-3-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)- 3-azabicyclo[3.2.2]nonane 386 0.035 6.24

2-(3-(3-(azepan-1-yl)pyrazin-2- yl)azetidin-1-yl)quinoline 360 0.003 6.25

2-(3-(3-(4-methyl-1,4- diazepan-1-yl)pyrazin-2- yl)azetidin-1-yl)quinoline 375 0.233 6.26

3-(3-(1-(quinolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)-3- azabicyclo[3.2.2]nonane 386 0.035 6.27

1-(4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)- 1,4-diazepan-1-yl)ethanone 403 0.01607 6.28

(R- & S-)-2-(3-(3-(3- phenylpyrrolidin-1-yl)pyrazin- 2-yl)azetidin-1-yl)quinoline 408 0.0050 6.29

(3S,4S)-1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)pyrrolidine-3,4-diol 364 0.085 6.30

N-(4-methoxybenzyl)-3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-amine 398 0.189 6.31

(1R,4R)-5-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)- 2-oxa-5- azabicyclo[2.2.1]heptane 360 0.01545 6.32

(R- & S-)-2-(1-(3-(1-(quinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)pyrrolidin-3-yl)thiazole 415 0.0871 6.33

(S)-(1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)pyrrolidin-2-yl)methanol 362 0.01457 6.34

((2S,4S)-4-fluoro-1-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-2- yl)methanol 380 0.02989 6.35

(R)-2-(3-(3-(2- (methoxymethyl)pyrrolidin-1- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 362 0.81150 6.36

2-(3-(3- (hexahydrocyclopenta[c]pyrrol- 2(1H)-yl)pyrazin-2-yl)azetidin- 1-yl)quinoline 372 0.00396 6.37

(R- & S-)-2-(3-(3-(3- isobutylpyrrolidin-1- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 388 0.02193 6.38

2-(3-(3-(3,3- dimethylpyrrolidin-1- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 360 0.01275 6.39

(R- & S-)-2-(3-(3-(3- (methoxymethyl)pyrrolidin-1- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 376 0.00666 6.40

2-(3-(3-(4- (trifluoromethyl)piperidin-1- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 414 0.0065 6.41

1-(3-(1-(quinolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)piperidine-4- carbonitrile 371 0.00013 6.42

2-(3-(3-(4,4-difluoropiperidin- 1-yl)pyrazin-2-yl)azetidin-1- yl)quinoline 382 0.0086 6.43

4-(3-(1-(quinolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)morpholine 348 0.0147 6.44

2-(3-(3-(4-fluoropiperidin-1- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 364 0.0014 6.45

2-(3-(3-(3-methoxyazetidin-1- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 348 0.021 6.46

2-(3-(3-(3,3-difluoroazetidin-1- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 354 0.027 6.47

4-methyl-1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidin-4-ol 376 0.0097 6.48

1-(3-(1-(quinolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)-1H- pyrazole-4-carbonitrile 354 0.066 6.49

2-(3-(3-(4-methyl-1H-pyrazol- 1-yl)pyrazin-2-yl)azetidin-1- yl)quinoline 343 0.020 6.50

tert-butyl (1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)azetidin-3-yl)carbamate 433 0.0056 6.51

2,2-dimethyl-4-(3-(1-(quinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)morpholine 376 0.006 6.52

2-(3-(3-(4-methyl-1H- imidazol-1-yl)pyrazin-2- yl)azetidin-1-yl)quinoline 343 0.005 6.53

1-(3-(1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 372 0.0015 6.54

(1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)- 1H-pyrazol-4-yl)methanol 359 0.091 6.55

(1-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)- 1H-imidazol-4-yl)methanol 359 0.270 6.56

1-methyl-4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperazin-2-one 375 0.0022 6.57

N-(2,6-dimethylphenyl)-1-(3- (1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-3- carboxamide 493 0.010 6.58

(S)-tert-butyl (1-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidin-3- yl)carbamate 461 0.013 6.59

(4-(cyclopropylmethyl)-1-(3- (1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidin-4- yl)methanol 430 0.004 6.60

2-(3-(3-((1R,5S)-8-methyl-3,8- diazabicyclo[3.2.1]octan-3- yl)pyrazin-2-yl)azetidin-1- yl)quinoline 387 >10

TABLE 18B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 6.1 TO 6.60. Unless otherwise stated, all starting materials are commercially available from common vendors. Key Starting Purification Ex. # Material(s) Key Starting Material(s) Reaction Condition Condition* 6.1

TEA, DMSO, 110° C. A 6.2

TEA, DMSO, 110° C. A 6.3

TEA, DMSO, 110° C. A 6.4

TEA, DMSO, 110° C. A 6.5

TEA, DMSO, 110° C. A 6.6

TEA, DMSO, 110° C. A 6.7

TEA, DMSO, 110° C. A 6.8

TEA, DMSO, 110° C. A 6.9

TEA, DMSO, 110° C. A 6.10

TEA, DMSO, 110° C. A 6.11

TEA, DMSO, 110° C. A 6.12

TEA, DMSO, 110° C. A 6.13

TEA, DMSO, 110° C. A 6.14

TEA, DMSO, 110° C. A 6.15

TEA, DMSO, 110° C. A 6.16

TEA, DMSO, 110° C., D 6.17

TEA, DMSO, 110° C. A 6.18

TEA, DMSO, 110° C. A 6.19

TEA, DMSO, 110° C. A 6.20

K₂CO₃, DMSO, 110° C. A 6.21

K₂CO₃, DMSO, 110° C. B 6.22

K₂CO₃, DMSO, 110° C. A 6.23

K₂CO₃, DMSO, 110° C. A 6.24

K₂CO₃, DMSO, 110° C. A 6.25

K₂CO₃, DMSO, 110° C. A 6.26

K₂CO₃, DMSO, 110° C. A 6.27

K₂CO₃, DMSO, 110° C. A 6.28

K₂CO₃, DMSO, 110° C. A 6.29

K₂CO₃, DMSO, 110° C. A 6.30

K₂CO₃, DMSO, 110° C. C 6.31

K₂CO₃, DMSO, 110° C. A 6.32

K₂CO₃, DMSO, 110° C. A 6.33

K₂CO₃, DMSO, 110° C. A 6.34

K₂CO₃, DMSO, 110° C. A 6.35

K₂CO₃, DMSO, 110° C. A 6.36

K₂CO₃, DMSO, 110° C. A 6.37

K₂CO₃, DMSO, 110° C. A 6.38

K₂CO₃, DMSO, 110° C. A 6.39

K₂CO₃, DMSO, 110° C. A 6.40

TEA, DMSO, 110° C. B 6.41

TEA, DMSO, 110° C. B 6.42

TEA, DMSO, 110° C. B 6.43

TEA, DMSO, 110° C. B 6.44

TEA, DMSO, 110° C. B 6.45

TEA, DMSO, 110° C. B 6.46

TEA, DMSO, 110° C. B 6.47

1. HCl 2. Et₃N, DMSO, 110° C. B 6.48

Cs₂CO₃, DMSO, 110° C. B 6.49

Cs₂CO₃, DMSO, 110° C. B 6.50

TEA, DMSO, 110° C. B 6.51

TEA, DMSO, 110° C. B 6.52

Cs₂CO₃, DMSO, 110° C. B 6.53

TEA, DMSO, 110° C. B 6.54

allylchloro[1,3- bis(2,6-di-i- propylphenyl)-4,5- dihydroimidazol-2- ylidene]palladium(II), Cs₂CO₃, Dioxane, 135° C., μW, 30 min E 6.55

TEA, DMSO, 110° C. B 6.56

TEA, DMSO, 110° C. B 6.57

TEA, DMSO, 110° C. B 6.58

TEA, DMSO, 110° C. B 6.59

TEA, DMSO, 110° C. B 6.60

K₂CO₃, DMSO, 110° C. C *Purification Conditions: Method A—reverse phase purification using the following conditions: (Instrumentation: MS—Waters SQ; UV—Waters 2487 or Waters PD; Solvents: A: Water w/0.1% NH₄OH B: Acetonitrile w/0.1% NH₄OH; Column: Phenomenex Gemini-NX C18 110A 5 um 21 × 100; Flow Rate: 44 mL/min. 10 min Method, variable gradient over 8 mins). Method B—purification by silica gel chromatography: (Biotage 50 g SNAP HP-silica column, eluting with a gradient of EtOAc in hexane). Method C—reverse-phase HPLC (Gilson; Gemini-NX 10 m C18 110A AXIA, 100 × 50 mm column) eluting with 0.1% TFA-H₂O:0.1% TFA CH₃CN (9:1 → 1:9). The fractions containing the desired product were combined and concentrated in vacuo. The residue was dissolved in DCM and loaded onto a Si-Carbonate cartridge (Silicycle) eluting with DCM. Method D—Product precipitated out of solution. Method E—purification by silica gel chromatography eluting with a gradient of MeOH in DCM.

TABLE 18C 1H NMR δ (PPM) DATA FOR EXAMPLES 6.1 TO 6.60 Ex. # Structure NMR 6.1 

(400 MHz, DMSO-d₆) 2.09 (quin, J = 9.88 Hz, 1H) 2.38 (td, J = 5.87, 2.35 Hz, 1H) 3.44-3.56 (m, 1H) 3.55-3.66 (m, 2H) 3.76 (td, J = 9.78, 6.65 Hz, 1H) 3.85 (dd, J = 9.78, 7.43 Hz, 1H) 4.27-4.49 (m, 5H) 6.78 (d, J = 9.00 Hz, 1H) 7.16-7.25 (m, 1H) 7.39 (dd, J = 7.82, 4.69 Hz, 1H) 7.46-7.59 (m, 2H) 7.70 (d, J = 7.82 Hz, 1H) 7.77-7.85 (m, 1H) 7.93-8.06 (m, 3H) 8.48 (dd, J = 4.69, 1.56 Hz, 1H) 8.60 (d, J = 2.35 Hz, 1H) 6.2 

(400 MHz, DMSO-d₆) 1.54-1.68 (m, 1H) 1.76 (q, J = 6.91 Hz, 2H) 2.02-2.24 (m, 2H) 2.68 (t, J = 7.63 Hz, 2H) 3.24 (t, J = 9.19 Hz, 1H) 3.42-3.60 (m, 3H) 4.34 (s, 4H) 4.45 (s, 1H) 6.78 (d, J = 9.00 Hz, 1H) 7.13-7.34 (m, 6H) 7.47-7.59 (m, 2H) 7.71 (d, J = 8.22 Hz, 1H) 7.91 (d, J = 2.74 Hz, 1H) 7.97 (d, J = 2.74 Hz, 1H) 8.03 (d, J = 9.00 Hz, 1H) 6.3 

(400 MHz, DMSO-d₆) 1.60-1.72 (m, 1H) 1.99 (dd, J = 10.56, 5.48 Hz, 1H) 2.75 (dd, J = 7.24, 2.54 Hz, 2H) 3.23-3.30 (m, 1H) 3.45 (dd, J = 10.17, 7.04 Hz, 1H) 3.50-3.59 (m, 2H) 4.25-4.44 (m, 5H) 6.77 (d, J = 8.61 Hz, 1H) 7.15-7.25 (m, 2H) 7.24-7.29 (m, 2H) 7.29- 7.36 (m, 2H) 7.47-7.60 (m, 2H) 7.70 (d, J = 7.82 Hz, 1H) 7.90 (d, J = 2.35 Hz, 1H) 7.96 (d, J = 2.74 Hz, 1H) 8.03 (d, J = 9.00 Hz, 1H) 6.4 

(400 MHz, DMSO-d₆) 2.02-2.18 (m, 1H) 2.38 (qd, J = 6.00, 3.91 Hz, 1H) 2.45-2.54 (m, 3H) 3.45-3.58 (m, 1H) 3.57-3.67 (m, 2H) 3.76 (td, J = 9.78, 6.65 Hz, 1H) 3.86 (dd, J = 9.78, 7.43 Hz, 1H) 4.30-4.50 (m, 5H) 6.78 (d, J = 9.00 Hz, 1H) 7.16-7.25 (m, 1H) 7.39 (dd, J = 7.82, 4.69 Hz, 1H) 7.47-7.59 (m, 2H) 7.70 (d, J = 7.82 Hz, 1H) 7.82 (d, J = 7.82 Hz, 1H) 7.95-8.06 (m, 3H) 8.48 (dd, J = 4.69, 1.56 Hz, 1H) 8.61 (d, J = 2.35 Hz, 1H) 6.5 

(400 MHz, DMSO-d₆) 1.43 (s, 8H) 2.01-2.13 (m, 2H) 2.47-2.54 (m, 3H) 2.81 (s, 3H) 3.46-3.60 (m, 4H) 4.29-4.40 (m, 4H) 4.40-4.49 (m, 1H) 6.79 (d, J = 8.61 Hz, 1H) 7.16-7.25 (m, 1H) 7.47-7.60 (m, 2H) 7.71 (d, J = 7.82 Hz, 1H) 7.95-8.06 (m, 2H) 6.6 

(400 MHz, DMSO-d₆) 1.76 (quin, J = 10.07 Hz, 1H) 2.07-2.17 (m, 1H) 2.22 (s, 5H) 2.64-2.77 (m, 1H) 3.17 (br. s., 1H) 3.41 (s, 1H) 3.44-3.67 (m, 3H) 4.35 (dt, J = 8.70, 4.45 Hz, 3H) 4.41-4.51 (m, 1H) 6.79 (d, J = 9.00 Hz, 1H) 7.17-7.25 (m, 1H) 7.47-7.60 (m, 2H) 7.71 (d, J = 7.43 Hz, 1H) 7.96 (dd, J = 18.78, 2.74 Hz, 2H) 8.03 (d, J = 9.00 Hz, 1H) 6.7 

(400 MHz, DMSO-d₆) 0.30 (q, J = 4.30 Hz, 1H) 0.66 (td, J = 7.63, 4.69 Hz, 1H) 1.59-1.70 (m, 2H) 3.46 (d, J = 10.17 Hz, 2H) 3.73 (d, J = 10.17 Hz, 2H) 4.23-4.35 (m, 3H) 4.36-4.46 (m, 2H) 6.78 (d, J = 9.00 Hz, 1H) 7.17-7.26 (m, 1H) 7.48-7.60 (m, 2H) 7.71 (d, J = 7.43 Hz, 1H) 7.97 (d, J = 2.35 Hz, 1H) 8.00 (d, J = 2.35 Hz, 1H) 8.03 (d, J = 9.00 Hz, 1H) 6.8 

(400 MHz, DMSO-d₆) 2.21-2.37 (m, 2H) 3.46-3.61 (m, 2H) 3.63-3.72 (m, 1H) 3.80 (dd, J = 11.74, 5.87 Hz, 1H) 4.18-4.40 (m, 6H) 6.77 (d, J = 9.00 Hz, 1H) 7.18- 7.26 (m, 1H) 7.48-7.56 (m, 1H) 7.55-7.61 (m, 1H) 7.67-7.75 (m, 3H) 7.77-7.86 (m, 1H) 7.93-7.99 (m, 2H) 8.00-8.07 (m, 3H) 6.9 

(400 MHz, DMSO-d₆) 2.23-2.35 (m, 1H) 2.38 (s, 3H) 2.43-2.51 (m, 1H) 3.61-3.74 (m, 2H) 3.79-3.88 (m, 1H) 3.88-3.99 (m, 2H) 4.33-4.48 (m, 5H) 6.81 (d, J = 9.00 Hz, 1H) 7.24 (ddd, J = 7.92, 6.55, 1.56 Hz, 1H) 7.51-7.63 (m, 2H) 7.74 (d, J = 7.43 Hz, 1H) 8.02- 8.04 (m, 1H) 8.04-8.08 (m, 2H) 6.10

(400 MHz, DMSO-d₆) 1.88 (d, J = 3.52 Hz, 1H) 1.92- 2.04 (m, 1H) 3.25 (d, J = 10.95 Hz, 1H) 3.40-3.50 (m, 1H) 3.64-3.76 (m, 2H) 4.29-4.42 (m, 5H) 4.42-4.51 (m, 1H) 4.97 (d, J = 3.13 Hz, 1H) 6.79 (d, J = 9.00 Hz, 1H) 7.21 (t, J = 7.43 Hz, 1H) 7.48-7.60 (m, 2H) 7.71 (d, J = 7.43 Hz, 1H) 7.91 (d, J = 2.74 Hz, 1H) 7.97 (d, J = 2.35 Hz, 1H) 8.03 (d, J = 9.00 Hz, 1H) 6.11

(400 MHz, DMSO-d₆) 1.97-2.13 (m, 1H) 2.38 (dq, J = 8.95, 6.15 Hz, 1H) 3.44-3.56 (m, 1H) 3.56-3.68 (m, 1H) 3.74 (td, J = 9.59, 7.04 Hz, 1H) 3.85 (dd, J = 9.98, 7.24 Hz, 1H) 4.29-4.49 (m, 1H) 6.78 (d, J = 9.00 Hz, 1H) 7.16-7.25 (m, 1H) 7.36-7.44 (m, 1H) 7.46-7.60 (m, 1H) 7.70 (d, J = 7.04 Hz, 1H) 7.97 (d, J = 2.74 Hz, 1H) 7.99-8.06 (m, 1H) 8.49-8.56 (m, 1H) 6.12

(400 MHz, DMSO-d₆) 1.91 (dt, J = 6.16, 3.37 Hz, 1H) 3.43-3.53 (m, 1H) 4.31-4.44 (m, 1H) 6.78 (d, J = 9.00 Hz, 1H) 7.17-7.24 (m, 1H) 7.48-7.59 (m, 1H) 7.70 (d, J = 7.82 Hz, 1H) 7.91 (d, J = 2.35 Hz, 1H) 7.97 (d, J = 2.35 Hz, 1H) 8.03 (d, J = 9.00 Hz, 1H) 6.13

(400 MHz, DMSO-d₆) 1.41 (s, 9H) 2.95 (br. s., 2H) 3.17 (d, J = 5.09 Hz, 1H) 3.40 (d, J = 3.91 Hz, 2H) 3.52 (br. s., 2H) 3.68 (dd, J = 10.37, 7.24 Hz, 2H) 4.10 (q, J = 5.09 Hz, 1H) 4.30-4.46 (m, 5H) 6.77 (d, J = 9.00 Hz, 1H) 7.16-7.26 (m, 1H) 7.46-7.59 (m, 2H) 7.70 (d, J = 7.82 Hz, 1H) 7.93-8.06 (m, 3H) 6.14

(400 MHz, DMSO-d₆) 1.41 (s, 8H) 2.95 (br. s., 2H) 3.17 (d, J = 5.09 Hz, 1H) 3.23 (d, J = 10.17 Hz, 2H) 3.40 (d, J = 3.91 Hz, 1H) 3.52 (br. s., 2H) 3.68 (dd, J = 10.56, 7.43 Hz, 2H) 4.10 (q, J = 4.96 Hz, 1H) 4.31-4.47 (m, 5H) 6.77 (d, J = 9.00 Hz, 1H) 7.17-7.25 (m, 1H) 7.47-7.59 (m, 2H) 7.71 (d, J = 7.43 Hz, 1H) 7.95-8.06 (m, 3H) 6.15

(400 MHz, DMSO-d₆) 1.36 (d, J = 19.56 Hz, 9H) 1.86-1.97 (m, 2H) 3.42 (dd, J = 11.35, 5.67 Hz, 4H) 3.53 (br. s., 4H) 4.20-4.35 (m, 3H) 4.42-4.50 (m, 2H) 6.81 (d, J = 8.80 Hz, 1H) 7.19-7.27 (m, 1H) 7.55 (dd, J = 6.65, 1.37 Hz, 1H) 7.58 (s, 1H) 7.73 (d, J = 7.43 Hz, 1H) 8.02-8.12 (m, 3H) 6.16

(400 MHz, DMSO-d₆) 1.69 (dq, J = 12.18, 7.81 Hz, 1H) 1.99 (dq, J = 12.10, 6.01 Hz, 1H) 2.29-2.42 (m, 1H) 3.32-3.37 (m, 1H) 3.38-3.56 (m, 5H) 4.29-4.38 (m, 4H) 4.39-4.47 (m, 1H) 4.70 (t, J = 5.38 Hz, 1H) 6.78 (d, J = 8.80 Hz, 1H) 7.16-7.25 (m, 1H) 7.47- 7.54 (m, 1H) 7.54-7.59 (m, 1H) 7.70 (d, J = 7.63 Hz, 1H) 7.91 (d, J = 2.54 Hz, 1H) 7.97 (d, J = 2.54 Hz, 1H) 8.03 (d, J = 8.80 Hz, 1H) 6.17

(400 MHz, DMSO-d₆) 2.34-2.45 (m, 1H) 2.95 (s, 3H) 3.51-3.61 (m, 1H) 3.63-3.73 (m, 1H) 3.80- 3.92 (m, 2H) 4.29-4.40 (m, 1H) 4.40-4.53 (m, 3H) 6.74 (d, J = 9.00 Hz, 1H) 7.21-7.29 (m, 1H) 7.52-7.59 (m, 1H) 7.60-7.65 (m, 1H) 7.66-7.72 (m, 1H) 7.96-8.05 (m, 2H) 6.18

(400 MHz, ACETONITRILE-d₃) 1.66-1.79 (m, 1H) 1.96-2.09 (m, 1H) 2.43 (dt, J = 14.23, 7.07 Hz, 1H) 3.35 (dd, J = 10.17, 7.04 Hz, 1H) 3.48-3.61 (m, 3H) 4.31-4.55 (m, 3H) 6.74 (d, J = 9.00 Hz, 1H) 7.21-7.30 (m, 1H) 7.52-7.59 (m, 1H) 7.60-7.66 (m, 1H) 7.66-7.73 (m, 1H) 7.89 (d, J = 2.54 Hz, 1H) 7.93 (d, J = 2.54 Hz, 1H) 7.99 (d, J = 9.00 Hz, 1H) 6.19

(400 MHz, DMSO-d₆) 1.41 (s, 9H) 1.86 (dq, J = 12.47, 6.41 Hz, 1H) 2.09 (dq, J = 12.62, 6.49 Hz, 1H) 3.17 (d, J = 5.09 Hz, 1H) 3.45-3.55 (m, 1H) 3.55-3.62 (m, 1H) 3.62-3.71 (m, 1H) 4.03-4.14 (m, 1H) 4.28-4.45 (m, 5H) 6.78 (d, J = 9.00 Hz, 1H) 7.14-7.25 (m, 2H) 7.48-7.60 (m, 2H) 7.71 (d, J = 7.43 Hz, 1H) 7.91-8.00 (m, 2H) 8.04 (d, J = 9.00 Hz, 1H) 6.20

(400 MHz, DMSO-d₆) 1.99-2.30 (m, 2H) 3.48- 3.64 (m, 2H) 3.71-3.96 (m, 2H) 4.30-4.42 (m, 4H) 4.45-4.55 (m, 1H) 5.32-5.52 (m, 1H) 6.78 (d, J = 9.00 Hz, 1H) 7.17-7.25 (m, 1H) 7.48-7.60 (m, 2H) 7.70 (d, J = 7.43 Hz, 1H) 7.95-8.06 (m, 3H) 6.21

(400 MHz, ACETONITRILE-d₃) (tt, J = 14.08, 7.24 Hz, 2H) 3.75 (t, J = 7.24 Hz, 2H) 3.89 (t, J = 13.20 Hz, 2H) 4.27-4.38 (m, 1H) 4.40- 4.54 (m, 4H) 6.77 (d, J = 8.80 Hz, 1H) 7.22-7.30 (m, 1H) 7.53-7.60 (m, 1H) 7.60-7.65 (m, 1H) 7.67-7.74 (m, 1H) 8.00 (d, J = 8.80 Hz, 1H) 8.07 (dd, J = 16.63, 2.54 Hz, 2H) 6.22

(400 MHz, DMSO-d₆) 0.96 (d, J = 6.65 Hz, 6H) 1.79- 1.91 (m, 2H) 2.45-2.54 (m, 1H) 2.58-2.65 (m, 2H) 2.70-2.77 (m, 2H) 2.86 (quin, J = 6.55 Hz, 1H) 3.42- 3.50 (m, 4H) 4.16-4.33 (m, 3H) 4.37-4.47 (m, 2H) 6.78 (d, J = 8.61 Hz, 1H) 7.16-7.26 (m, 1H) 7.46-7.60 (m, 2H) 7.70 (d, J = 7.43 Hz, 1H) 7.98-8.06 (m, 3H) 6.23

(400 MHz, DMSO-d₆) 1.67 (d, J = 9.78 Hz, 1H) 1.83 (d, J = 7.82 Hz, 1H) 2.11 (br. s., 1H) 3.31 (d, J = 4.69 Hz, 1H) 4.26-4.33 (m, 1H) 4.32-4.42 (m, 1H) 4.43-4.51 (m, 1H) 6.79 (d, J = 9.00 Hz, 1H) 7.17-7.25 (m, 1H) 7.48-7.60 (m, 1H) 7.71 (d, J = 7.43 Hz, 1H) 8.04 (d, J = 9.00 Hz, 1H) 8.11 (d, J = 2.35 Hz, 1H) 8.15 (d, J = 2.35 Hz, 1H) 6.24

(400 MHz, DMSO-d₆) 1.53-1.62 (m, 4H) 1.79 (br. s., 4H) 3.42-3.48 (m, 5H) 4.20-4.31 (m, 1H) 4.39 (t, J = 7.04 Hz, 2H) 4.46-4.55 (m, 2H) 6.85 (d, J = 9.00 Hz, 1H) 7.28 (t, J = 6.85 Hz, 1H) 7.54-7.65 (m, 2H) 7.76 (d, J = 7.82 Hz, 1H) 8.03 (q, J = 2.35 Hz, 2H) 8.12 (d, J = 9.00 Hz, 1H) 6.25

(400 MHz, DMSO-d₆) 1.89-2.01 (m, 1H) 2.35 (s, 1H) 2.60-2.69 (m, 1H) 2.80 (d, J = 3.52 Hz, 1H) 3.48 (br. s., 2H) 3.50-3.56 (m, 1H) 4.18-4.34 (m, 1H) 4.37-4.47 (m, 1H) 6.78 (d, J = 8.61 Hz, 1H) 7.17-7.26 (m, 1H) 7.47-7.60 (m, 1H) 7.71 (d, J = 7.43 Hz, 1H) 7.99-8.07 (m, 1H) 6.26

(400 MHz, DMSO-d₆) 1.66 (d, J = 9.78 Hz, 1H) 1.83 (d, J = 7.43 Hz, 1H) 2.11 (br. s., 1H) 3.31 (d, J = 4.30 Hz, 1H) 4.26-4.33 (m, 1H) 4.33-4.42 (m, 1H) 4.43-4.52 (m, 1H) 6.79 (d, J = 9.00 Hz, 1H) 7.18-7.26 (m, 1H) 7.48-7.61 (m, 1H) 7.71 (d, J = 7.82 Hz, 1H) 8.04 (d, J = 9.00 Hz, 1H) 8.11 (d, J = 2.35 Hz, 1H) 8.15 (d, J = 2.35 Hz, 1H) 6.27

(400 MHz, DMSO-d₆) 1.77-1.88 (m, 1H) 1.96 (s, 2H) 3.12-3.30 (m, 5H) 3.40-3.61 (m, 6H) 3.66 (br. s., 1H) 4.18-4.36 (m, 2H) 4.41-4.52 (m, 1H) 6.76-6.84 (m, 1H) 7.23 (t, J = 7.43 Hz, 1H) 7.48-7.62 (m, 1H) 7.72 (d, J = 7.82 Hz, 1H) 8.01- 8.14 (m, 2H) 6.28

(400 MHz, DMSO-d₆) 2.05 (quin, J = 9.98 Hz, 1H) 2.34 (qd, J = 5.93, 4.11 Hz, 1H) 3.40-3.52 (m, 1H) 3.53- 3.65 (m, 2H) 3.68-3.86 (m, 2H) 4.29-4.49 (m, 5H) 6.77 (d, J = 8.61 Hz, 1H) 7.16-7.29 (m, 2H) 7.30-7.41 (m, 4H) 7.47-7.59 (m, 2H) 7.70 (d, J = 7.43 Hz, 1H) 7.91-8.06 (m, 3H) 6.29

(400 MHz, DMSO-d₆) 3.22 (d, J = 11.35 Hz, 2H) 3.85 (dd, J = 11.15, 3.72 Hz, 2H) 4.02 (br. s., 2H) 4.26-4.42 (m, 4H) 4.50 (t, J = 6.06 Hz, 1H) ¹H NMR (400 MHz, DMSO-d₆) δ 5.15 (d, J = 2.35 Hz, 2H) 6.78 (d, J = 9.00 Hz, 1H) 7.16-7.25 (m, 1H) 7.48-7.55 (m, 1H) 7.55-7.60 (m, 1H) 7.71 (d, J = 7.82 Hz, 1H) 7.90 (d, J = 2.35 Hz, 1H) 7.96 (d, J = 2.74 Hz, 1H) 8.03 (d, J = 9.00 Hz, 1H) 6.30

(400 MHz, DMSO-d₆) 3.74 (s, 3H) 4.18-4.27 (m, 1H) 4.28-4.36 (m, 2H) 4.47-4.57 (m, 3H) 6.82 (d, J = 8.80 Hz, 1H) 6.89 (d, J = 8.61 Hz, 2H) 7.06 (t, J = 5.97 Hz, 1H) 7.19-7.31 (m, 3H) 7.50-7.57 (m, 1H) 7.57-7.62 (m, 1H) 7.69-7.76 (m, 2H) 7.88 (d, J = 2.74 Hz, 1H) 8.05 (d, J = 8.80 Hz, 1H) 6.31

(400 MHz, DMSO-d₆) 1.81-1.88 (m, 1H) 1.88-1.94 (m, 1H) 3.21 (d, J = 9.39 Hz, 1H) 3.73 (dd, J = 9.19, 1.37 Hz, 1H) 3.80 (dd, J = 7.63, 1.37 Hz, 1H) 3.86 - ¹H NMR (400 MHz, DMSO-d₆) δ 3.92 (m, 1H) 4.17-4.27 (m, 1H) 4.28-4.39 (m, 3H) 4.43-4.51 (m, 1H) 4.63 (s, 1H) 4.69 (s, 1H) 6.78 (d, J = 9.00 Hz, 1H) 7.17- 7.25 (m, 1H) 7.48-7.60 (m, 2H) 7.70 (d, J = 7.43 Hz, 1H) 7.98-8.06 (m, 3H) 6.32

(400 MHz, DMSO-d₆) 1.92-2.11 (m, 3H) 3.40 (dd, J = 8.61, 3.52 Hz, 2H) 3.94-4.04 (m, 1H) 4.36-4.48 (m, 4H) 4.50-4.58 (m, 1H) 5.68 (t, J = 7.04 Hz, 1H) 6.80 (d, J = 9.00 Hz, 1H) 7.17-7.25 (m, 1H) 7.48 (d, J = 3.13 Hz, 1H) 7.50-7.56 (m, 1H) 7.56-7.61 (m, 1H) 7.68 (d, J = 3.13 Hz, 1H) 7.71 (d, J = 7.04 Hz, 1H) 7.98 (d, J = 2.74 Hz, 1H) 8.02-8.08 (m, 2H) 6.33

(400 MHz, DMSO-d₆) 1.66-1.81 (m, 1H) 1.88 (d, J = 7.43 Hz, 1H) 1.94 (ddd, J = 13.89, 7.04, 3.33 Hz, 1H) 2.00-2.10 (m, 1H) 3.21 (t, J = 7.24 Hz, 1H) 3.47-3.56 (m, 1H) 3.65-3.76 (m, 1H) 4.25-4.37 (m, 5H) 4.47-4.56 (m, 1H) 4.62 (t, J = 5.67 Hz, 1H) 6.77 (d, J = 9.00 Hz, 1H) 7.16-7.24 (m, 1H) 7.52 (dd, J = 6.85, 1.37 Hz, 1H) 7.54-7.59 (m, 1H) 7.70 (d, J = 7.43 Hz, 1H) 7.94-7.97 (m, 1H) 7.97-8.00 (m, 1H) 8.02 (d, J = 9.00 Hz, 1H) 6.34

(400 MHz, DMSO-d₆) 2.17-2.38 (m, 2H) 3.33- 3.40 (m, 1H) 3.47-3.63 (m, 2H) 3.95 (t, J = 13.11 Hz, 1H) 4.26-4.41 (m, 3H) 4.45-4.57 (m, 2H) 4.77 (t, J = 5.48 Hz, 1H) 5.27-5.48 (m, 1H) 6.78 (d, J = 9.00 Hz, 1H) 7.22 (t, J = 7.24 Hz, 1H) 7.53 (d, J = 6.65 Hz, 1H) 7.55-7.61 (m, 1H) 7.71 (d, J = 7.82 Hz, 1H) 8.00-8.09 (m, 2H) 6.35

(400 MHz, DMSO-d₆) ppm 1.67-1.86 (m, 2H) 1.90-2.00 (m, 1H) 2.05-2.15 (m, 1H) 3.15-3.26 (m, 4H) 3.47 (dd, J = 9.39, 3.91 Hz, 1H) 3.65-3.75 (m, 1H) 4.22-4.36 (m, 4H) 4.44 (dd, J = 6.85, 4.11 Hz, 1H) 4.47-4.56 (m, 1H) 6.76 (d, J = 9.00 Hz, 1H) 7.17- 7.24 (m, 1H) 7.47-7.54 (m, 1H) 7.55 (s, 1H) 7.70 (d, J = 7.82 Hz, 1H) 7.96-8.06 (m, 2H) 6.36

(400 MHz, DMSO-d₆) 1.45-1.62 (m, 1H) 1.68-1.84 (m, 1H) 2.72 (br. s., 1H) 3.15 (dd, J = 10.17, 3.52 Hz, 1H) 3.41 (br. s., 1H) 3.55 (dd, J = 10.76, 7.63 Hz, 1H) 4.33 (d, J = 2.35 Hz, 2H) 4.44 (s, 1H) 6.79 (d, J = 9.00 Hz, 1H) 7.21 (t, J = 7.04 Hz, 1H) 7.48-7.59 (m, 1H) 7.71 (d, J = 7.82 Hz, 1H) 7.97-8.06 (m, 2H) 6.37

(400 MHz, DMSO-d₆) 0.92 (dd, J = 6.46, 2.93 Hz, 4H) 1.33 (t, J = 6.94 Hz, 1H) 1.52 (quin, J = 9.93 Hz, 1H) 1.58-1.70 (m, 1H) 2.01-2.12 (m, 1H) 2.19-2.31 (m, 1H) 3.13-3.22 (m, 1H) 3.40-3.49 (m, 1H) 3.49-3.64 (m, 1H) 4.29-4.39 (m, 3H) 4.45 (s, 1H) 6.78 (d, J = 8.80 Hz, 1H) 7.21 (t, J = 6.75 Hz, 1H) 7.47-7.60 (m, 1H) 7.70 (d, J = 7.82 Hz, 1H) 7.91 (d, J = 2.35 Hz, 1H) 7.96 (d, J = 2.35 Hz, 1H) 8.03 (d, J = 8.80 Hz, 1H) 6.38

(400 MHz, DMSO-d₆) 1.11 (s, 5H) 1.73 (t, J = 7.04 Hz, 2H) 3.24 (s, 2H) 3.59 (t, J = 6.85 Hz, 2H) 4.30-4.45 (m, 5H) 6.78 (d, J = 9.00 Hz, 1H) 7.17-7.25 (m, 1H) 7.47-7.60 (m, 2H) 7.70 (d, J = 7.82 Hz, 1H) 7.90 (d, J = 2.74 Hz, 1H) 7.96 (d, J = 2.35 Hz, 1H) 8.03 (d, J = 8.61 Hz, 1H) 6.39

(400 MHz, DMSO-d₆) 1.62-1.74 (m, 1H) 2.02 (dd, J = 11.74, 5.09 Hz, 1H) 3.25-3.32 (m, 4H) 3.37-3.43 (m, 2H) 3.46-3.59 (m, 3H) 4.30-4.46 (m, 5H) 6.78 (d, J = 9.00 Hz, 1H) 7.16-7.24 (m, 1H) 7.48-7.60 (m, 2H) 7.70 (d, J = 7.82 Hz, 1H) 7.92 (d, J = 2.35 Hz, 1H) 7.97 (d, J = 2.74 Hz, 1H) 8.03 (d, J = 9.00 Hz, 1H) 6.40

(300 MHz, MeOH) 8.22 (1H, d, J = 2.6 Hz), 8.15 (1H, d, J = 2.5 Hz), 8.01 (1H, d, J = 8.9 Hz), 7.64-7.74 (2H, m), 7.55 (1H, td, J = 7.7, 1.4 Hz), 7.18-7.30 (1H, m), 6.77 (1H, d, J = 8.9 Hz), 4.54-4.67 (2H, m), 4.38- 4.49 (3H, m), 3.57 (2H, d, J = 12.9 Hz), 2.76-3.03 (2H, m), 2.42 (1H, m), 1.96-2.13 (2H, m), 1.66-1.96 (2H, m). 6.41

(300 MHz, MeOH) 8.22 (1H, d, J = 2.6 Hz), 8.15 (1H, d, J = 2.5 Hz), 8.01 (1H, d, J = 8.9 Hz), 7.64-7.74 (2H, m), 7.55 (1H, td, J = 7.7, 1.4 Hz), 7.18-7.30 (1H, m), 6.77 (1H, d, J = 8.9 Hz), 4.54-4.67 (2H, m), 4.38-4.49 (3H, m), 3.31-3-36 (2H, m), 3.00-3.16 (3H, m), 1.99-2.22 (4H, m) 6.42

(300 MHz, MeOH) 8.22 (1H, d, J = 2.6 Hz), 8.15 (1H, d, J = 2.5 Hz), 8.01 (1H, d, J = 8.9 Hz), 7.64-7.74 (2H, m), 7.55 (1H, td, J = 7.7, 1.4 Hz), 7.18-7.30 (1H, m), 6.77 (1H, d, J = 8.9 Hz), 4.54-4.67 (2H, m), 4.38-4.49 (3H, m), 3.31-3-36 (4H, m), 2.13-2.27 (4H, m) 6.43

(300 MHz, MeOH) 8.22 (1H, d, J = 2.6 Hz), 8.15 (1H, d, J = 2.5 Hz), 8.01 (1H, d, J = 8.9 Hz), 7.64-7.74 (2H, m), 7.55 (1H, td, J = 7.7, 1.4 Hz), 7.18-7.30 (1H, m), 6.77 (1H, d, J = 8.9 Hz), 4.54-4.67 (2H, m), 4.38-4.49 (3H, m), 3.83-3.99 (4H, m), 3.06-3.27 (4H, m) 6.44

(300 MHz, MeOH) 8.20 (1H, d, J = 2.5 Hz), 8.14 (1H, d, J = 2.6 Hz), 8.01 (1H, d, J = 8.9 Hz), 7.64-7.74 (2H, m), 7.49-7.60 (1H, m), 7.20-7.30 (1H, m), 6.77 (1H, d, J = 8.9 Hz), 4.94 (1H, dt, J = 6.6, 3.3 Hz), 4.78 (1H, dt, J = 6.7, 3.3 Hz), 4.54-4.67 (2H, m), 4.35-4.52 (3H, m), 3.24-3.45 (1H, m), 3.05-3.22 (2H, m), 1.90-2.25 (4H, m) 6.45

(300 MHz, MeOH) 7.93-8.04 (3H, m), 7.64-7.73 (2H, m), 7.55 (1H, ddd, J = 8.4, 7.0, 1.4 Hz), 7.19-7.30 (1H, m), 6.76 (1H, d, J = 8.9 Hz), 4.45-4.57 (4H, m), 4.30-4.44 (3H, m), 4.10-4.26 (1H, m), 3.93-4.08 (2H, m), 3.38 (3H, s) 6.46

(300 MHz, MeOH) 8.09 (2H, q, J = 2.6 Hz), 8.01 (1H, d, J = 8.9 Hz), 7.64-7.73 (2H, m), 7.55 (1H, ddd, J = 8.5, 6.9, 1.4 Hz), 7.25 (1H, td, J = 7.5, 1.0 Hz), 6.77 (1H, d, J = 9.1 Hz), 4.45-4.61 (8H, m), 4.10-4.27 (1H, m) 6.47

(300 MHz, MeOH) 8.17 (1H, d, J = 2.5 Hz), 8.12 (1H, d, J = 2.6 Hz), 8.01 (1H, d, J = 8.9 Hz), 7.69 (2H, dd, J = 8.0, 5.2 Hz), 7.55 (1H, td, J = 7.7, 1.5 Hz), 7.20-7.30 (1H, m), 6.77 (1H, d, J = 8.9 Hz), 4.51-4.65 (2H, m), 4.36-4.49 (3H, m), 3.09-3.38 (4H, m), 1.69-1.93 (4H, m), 1.32 (3H, s) 6.48

(300 MHz, MeOH) 9.08-9.13 (1H, m), 8.77 (1H, d, J = 2.5 Hz), 8.50 (1H, d, J = 2.3 Hz), 8.28 (1H, s), 8.01 (1H, d, J = 9.1 Hz), 7.63-7.72 (2H, m), 7.50-7.59 (1H, m), 7.24 (1H, td, J = 7.5, 1.0 Hz), 6.75 (1H, d, J = 8.9 Hz), 4.74 (1H, quin, J = 7.2 Hz), 4.46-4.60 (4H, m) 6.49

(300 MHz, MeOH) 8.60 (1H, d, J = 2.5 Hz), 8.40 (1H, d, J = 2.5 Hz), 8.24 (1H, s), 7.99 (1H, d, J = 8.9 Hz), 7.62-7.74 (3H, m), 7.54 (1H, ddd, J = 8.5, 7.0, 1.5 Hz), 7.23 (1H, td, J = 7.5, 1.0 Hz), 6.73 (1H, d, J = 9.1 Hz), 4.74-4.84 (1H, m), 4.38-4.59 (4H, m), 2.22 (3H, s) 6.50

(300 MHz, DMSO-d₆) 8.03 (2H, dd, J = 5.7, 3.1 Hz), 7.96 (1H, d, J = 2.6 Hz), 7.71 (1H, d, J = 7.6 Hz), 7.46-7.62 (3H, m), 7.21 (1H, ddd, J = 8.0, 6.5, 1.6 Hz), 6.78 (1H, d, J = 8.8 Hz), 4.25-4.52 (7H, m), 3.97-4.18 (1H, m), 3.92 (2H, dd, J = 8.1, 5.6 Hz), 1.40 (9H, s) 6.51

(300 MHz, DMSO-d₆) 8.25 (1H, d, J = 2.5 Hz), 8.20 (1H, d, J = 2.5 Hz), 8.04 (1H, d, J = 8.9 Hz), 7.71 (1H, d, J = 8.2 Hz), 7.48-7.63 (2H, m), 7.14-7.28 (1H, m), 6.80 (1H, d, J = 8.9 Hz), 4.44-4.56 (2H, m), 4.23-4.44 (3H, m), 3.78-3.89 (2H, m), 2.99-3.12 (2H, m), 2.89 (2H, s), 1.30 (6H, s) 6.52

(300 MHz, DMSO-d₆) 8.76 (1H, d, J = 2.5 Hz), 8.56 (1H, d, J = 2.5 Hz), 7.96-8.07 (2H, m), 7.71 (1H, d, J = 7.6 Hz), 7.46-7.60 (2H, m), 7.35 (1H, s), 7.22 (1H, ddd, J = 7.9, 6.5, 1.5 Hz), 6.76 (1H, d, J = 8.9 Hz), 4.35-4.51 (2H, m), 4.24-4.31 (3H, m), 2.20 (3H, s). 6.53

(400 MHz, MeOH) 9.03 (1H, s), 8.12 (1H, d, J = 2.5 Hz), 8.05 (1H, d, J = 2.5 Hz), 7.73 (1H, d, J = 7.6 Hz), 7.60-7.69 (1H, m), 7.51 (1H, d, J = 8.6 Hz), 7.21 (1H, t, J = 7.5 Hz), 4.50-4.58 (2H, m), 4.24-4.42 (3H, m), 3.22-3.32 (2H, m), 2.86-3.06 (3H, m), 2.00-2.12 (2H, m), 1.87-2.00 (2H, m) 6.54

(400 MHz, MeOH) 8.52 (1H, d, J = 2.3 Hz), 8.32 (2H, s), 7.88 (1H, d, J = 8.8 Hz), 7.75 (1H, s), 7.56 (2H, dd, J = 7.8, 4.1 Hz), 7.43 (1H, t, J = 7.7 Hz), 7.12 (1H, t, J = 7.5 Hz), 6.63 (1H, d, J = 9.0 Hz), 4.65-4.73 (1H, m), 4.54 (2H, s), 4.33-4.46 (4H, m) 6.55

(300 MHz, DMSO-d₆) 8.78 (2H, d, J = 2.5 Hz), 8.57 (2H, d, J = 2.3 Hz), 8.03 (3H, dd, J = 5.1, 3.8 Hz), 7.71 (2H, d, J = 7.6 Hz), 7.43-7.62 (5H, m), 7.22 (2H, ddd, J = 7.9, 6.6, 1.5 Hz), 6.76 (2H, d, J = 8.9 Hz), 5.06 (2H, t, J = 5.6 Hz), 4.48 (2H, m), 4.28-4.31 (3H, m), 4.26 (2H, d, J = 5.6 Hz). 6.56

(400 MHz, MeOH) 8.17 (1H, d, J = 2.5 Hz), 8.07 (1H, d, J = 2.5 Hz), 7.90 (1H, d, J = 8.8 Hz), 7.57 (2H, dd, J = 8.0, 3.7 Hz), 7.40-7.48 (1H, m), 7.13 (1H, t, J = 7.1 Hz), 6.66 (1H, d, J = 8.8 Hz), 4.41-4.56 (2H, m), 4.28-4.41 (3H, m), 3.81 (2H, s), 3.41 (4H, s), 2.92 (3H, s) 6.57

(400 MHz, MeOH) 8.11 (1H, d, J = 2.5 Hz), 8.05 (1H, d, J = 2.5 Hz), 7.91 (1H, d, J = 9.0 Hz), 7.58 (2H, dd, J = 7.7, 4.4 Hz), 7.40-7.47 (1H, m), 7.14 (1H, t, J = 7.5 Hz), 6.99 (3H, s), 6.66 (1H, d, J = 9.0 Hz), 4.43-4.57 (2H, m), 4.27-4.43 (3H, m), 3.58 (1H, d, J = 11.0 Hz), 3.35 (1H, d, J = 12.7 Hz), 3.05-3.15 (1H, m), 2.77-2.96 (2H, m), 2.02-2.31 (7H, m), 1.70-1.94 (3H, m) 6.58

(400 MHz, MeOH) 8.21 (1H, d, J = 2.5 Hz), 8.13 (1H, d, J = 2.5 Hz), 8.02 (1H, d, J = 8.8 Hz), 7.69 (2H, dd, J = 7.6, 4.9 Hz), 7.56 (1H, t, J = 7.6 Hz), 7.25 (1H, t, J = 7.4 Hz), 6.77 (1H, d, J = 8.8 Hz), 4.56-4.73 (2H, m), 4.36-4.52 (3H, m), 3.69-3.83 (1H, m), 3.39 (1H, m), 2.97 (1H, t, J = 8.9 Hz), 2.76 (1H, dd, J = 12.1, 8.6 Hz), 1.91-2.02 (2H, m), 1.82 (1H, m), 1.40-1.59 (10H, m), 1.29-1.40 (1H, m) 6.59

(300 MHz, MeOH) 8.56 (1H, d, J = 2.5 Hz), 8.44 (1H, d, J = 2.5 Hz), 7.69 (2H, dd, J = 7.7, 5.6 Hz), 7.56 (1H, t, J = 7.7 Hz), 7.25 (1H, t, J = 7.5 Hz), 6.78 (1H, d, J = 8.8 Hz), 4.54-4.72 (2H, m), 4.34-4.54 (3H, m), 3.64 (2H, s), 3.09-3.28 (4H, m), 1.68-1.86 (4H, m), 1.31 (1H, m), 0.84-1.01 (1H, m), 0.77 (1H, t, J = 6.8 Hz), 0.38-0.59 (2H, m), 0.07-0.19 (2H, m) 6.60

(400 MHz, DMSO-d₆) 1.61-1.78 (m, 1H) 1.89 (br. s., 1H) 2.18 (s, 2H) 2.98-3.16 (m, 3H) 3.20 (d, J = 11.15 Hz, 1H) 3.36-3.55 (m, 1H) 3.67 (d, J = 13.30 Hz, 1H) 4.06 (t, J = 11.05 Hz, 1H) 4.33 (d, J = 11.74 Hz, 1H) 6.58 (d, J = 9.39 Hz, 1H) 7.17 (t, J = 7.34 Hz, 1H) 7.37-7.44 (m, 1H) 7.44-7.53 (m, 1H) 7.56 (d, J = 7.43 Hz, 1H) 8.21 (d, J = 2.54 Hz, 1H) 8.24 (d, J = 2.54 Hz, 1H)

Examples 6.61 and 6.62 Separated Stereoisomers of Example 6.1

Note: the absolute stereochemistry of each separated isomer was not further determined. 2-(3-(3-(3-(pyridin-3-yl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline (SCHEME 6, Example 6.1) was chirally separated by using a Chiralpak ASH (150×4.6 mm i.d.), mobile phase 85% liquid CO₂/15% methanol containing 0.2% DEA (Flow rate: 4 ml/min, column temp: 40° C., outlet pressure: 100 Bar, wavelength: 248 nm)

Separated Isomer Example 6.61

ESI-MS (M+1): 409. PDE10 IC₅₀ (uM): 0.0115.

¹H NMR δ (ppm) (400 MHz, DMSO-d₆) δ ppm 2.00-2.16 (m, 1H) 2.31-2.44 (m, 1H) 3.46-3.57 (m, 1H) 3.57-3.68 (m, 2H) 3.68-3.81 (m, 1H) 3.81-3.90 (m, 1H) 4.30-4.52 (m, 4H) 6.79 (d, J=9.00 Hz, 1H) 7.21 (t, J=7.24 Hz, 1H) 7.39 (dd, J=7.82, 4.69 Hz, 1H) 7.45-7.61 (m, 2H) 7.71 (d, J=8.02 Hz, 1H) 7.82 (d, J=7.83 Hz, 1H) 7.94-8.08 (m, 3H) 8.49 (d, J=4.50 Hz, 1H) 8.61 (s, 1H)

Separated Isomer Example 6.62

ESI-MS (M+1): 409. PDE10 IC₅₀ (uM): 0.0022.

¹H NMR δ (ppm) (400 MHz, DMSO-d₆) δ ppm 2.10 (quin, J=9.93 Hz, 1H) 2.30-2.44 (m, 1H) 3.46-3.58 (m, 1H) 3.58-3.68 (m, 2H) 3.70-3.81 (m, 1H) 3.86 (dd, J=9.59, 7.43 Hz, 1H) 4.30-4.51 (m, 5H) 6.79 (d, J=9.00 Hz, 1H) 7.22 (t, J=6.75 Hz, 1H) 7.39 (dd, J=7.82, 4.69 Hz, 1H) 7.47-7.61 (m, 2H) 7.71 (d, J=7.82 Hz, 1H) 7.82 (d, J=7.83 Hz, 1H) 7.95-8.07 (m, 3H) 8.49 (d, J=3.52 Hz, 1H) 8.61 (d, J=1.76 Hz, 1H)

Example 7 Methyl (1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate

Step 1. tert-Butyl (1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate: To a round bottomed flask was added 2-(3-(3-chloropyrazin-2-yl)azetidin-1-yl)quinoline (1.0337 g, 3.48 mmol), tert-butyl pyrrolidin-3-ylcarbamate (commercially available from TCI, 1.298 g, 6.97 mmol), and triethylamine (commercially available from Aldrich, 0.971 ml, 6.97 mmol) in DMSO (11.61 ml) to stir at 110° C. overnight.

The reaction mixture was diluted with water and extracted with CH₂Cl₂. The organic extract was washed with water, saturated NaCl, dried over MgSO₄, filtered and concentrated in vacuo. The crude product was adsorbed onto a plug of silica gel and chromatographed through a Biotage 50 g SNAP HP-silica column, eluting with a gradient of 10% to 100% EtOAc in hexane, to provide tert-butyl (1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate (1.3145 g, 2.94 mmol, 85% yield). ¹H NMR (400 MHz, DMSO-d₆) δ ppm 1.41 (s, 9H) 1.86 (dq, J=12.35, 6.32 Hz, 1H) 2.01-2.15 (m, 1H) 3.34 (d, J=4.89 Hz, 1H) 3.44-3.54 (m, 1H) 3.54-3.62 (m, 1H) 3.61-3.71 (m, 1H) 4.08 (d, J=5.67 Hz, 1H) 4.27-4.45 (m, 3H) 6.78 (d, J=8.80 Hz, 1H) 7.15-7.26 (m, 1H) 7.47-7.60 (m, 1H) 7.71 (d, J=7.82 Hz, 1H) 7.93 (d, J=2.54 Hz, 1H) 7.98 (d, J=2.35 Hz, 1H) 8.03 (d, J=8.80 Hz, 1H) ESI (M+1) 447.0; calc for C₂₅H₃₀N₆O₂ 446.

Step 2. 1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-amine

To a round bottomed flask was added tert-butyl (1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate (1.3145 g, 2.94 mmol) and hydrogen chloride, 1M in diethyl ether (0.089 ml, 2.94 mmol) to stir. Solvent was evaporated. The reaction mixture was diluted with saturated sodium bicarbonate and extracted with CH₂Cl₂. The organic extract was washed with water, saturated Na₂CO₃, saturated NaCl, dried over MgSO₄, filtered and concentrated in vacuo to give 1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-amine (0.696 g, 2.009 mmol, 68.2% yield).

Step 3. methyl (1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate

To a round bottomed flask was added 1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-amine (0.0974 g, 0.281 mmol), pyridine (commercially available through Aldrich, 0.045 ml, 0.562 mmol), and 4-(pyrrolidin-1-yl)pyridine (PPY) (commercially available through Alfa Aesar, 0.042 g, 0.281 mmol) to stir at RT in DCM (0.937 ml). Methyl carbonochloridate (commercially available through Aldrich, 0.027 ml, 0.422 mmol) was added and allowed to stir overnight. The crude product was adsorbed onto a plug of silica gel and chromatographed through a Biotage 50 g SNAP HP-silica column, eluting with a gradient of 1% to 6% MeOH in CH₂Cl₂, to provide methyl (1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate.

The following Table 19A lists compounds of Examples 7.1 to 7.5, which were made analogous to Scheme 7, Steps 2 and 3, by using the appropriate materials and reaction conditions, which are listed in Table 19B. The NMR data of the Examples are listed in Table 19C.

TABLE 19A EXAMPLES 7.1 TO 7.5 ESI-MS IC₅₀ Ex. # Structure Chemical Name (M + 1) (μM) 7.1

(R- & S-)-methyl (1-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-3- yl)carbamate 405.1 0.002 7.2

1-(3-(1-(quinolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)pyrrolidin-3- amine 347.1 0.038 7.3

(R- & S-)-N-(1-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-3- yl)methanesulfonamide 425 0.011 7.4

(R- & S-)-ethyl (1-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-3- yl)carbamate 419 0.001 7.5

(R- & S-)-2-methoxy-N-(1-(3- (1-(quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-3- yl)acetamide 419 0.0044

TABLE 19B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 7.3 TO 7.5. Examples 7.1 to 7.2 are prepared as described in Scheme 7. Unless otherwise stated, all starting materials are commercially available from common vendors Key Starting Purification Ex. # Material(s) Key Starting Material(s) Reaction Condition Condition* 7.3

4-PPY, Py, DCM, RT A 7.4

4-PPY, Py, DCM, RT A 7.5

4-PPY, Py, DCM, RT A *Purification Method A: purification by silica gel chromatography: (Biotage 50 g SNAP HP-silica column, eluting with a gradient of 1% to 6% MeOH in CH₂Cl₂).

TABLE 19C 1H NMR δ (PPM) DATA FOR EXAMPLES 7.1 TO 7.5 Ex. # Structure NMR 7.1

(400 MHz, DMSO-d₆) 0.83-0.94 (m, 1H) 1.20-1.40 (m, 1H) 1.70 (dq, J = 12.37, 6.31 Hz, 1H) 1.86 (br. s., 1H) 1.96-2.09 (m, 1H) 3.17 (dd, J = 9.98, 4.69 Hz, 1H) 3.44-3.59 (m, 2H) 3.59-3.71 (m, 2H) 4.30-4.48 (m, 4H) 6.80 (d, J = 9.00 Hz, 1H) 7.23 (t, J = 6.85 Hz, 1H) 7.48-7.62 (m, 2H) 7.72 (d, J = 7.82 Hz, 1H) 7.92 (d, J = 2.35 Hz, 1H) 7.98 (d, J = 2.35 Hz, 1H) 8.05 (d, J = 9.00 Hz, 1H) 7.2

(400 MHz, DMSO-d₆) 1.88 (dq, J = 12.52, 6.39 Hz, 1H) 2.04-2.17 (m, 3H) 3.35 (dd, J = 10.56, 4.89 Hz, 1H) 3.47-3.65 (m, 4H) 3.68 (dd, J = 10.56, 6.26 Hz, 1H) 4.07-4.17 (m, 1H) 4.29-4.44 (m, 4H) 6.78 (d, J = 8.80 Hz, 1H) 7.16-7.25 (m, 1H) 7.45-7.59 (m, 2H) 7.70 (d, J = 7.63 Hz, 1H) 7.93 (d, J = 2.35 Hz, 1H) 7.98 (d, J = 2.54 Hz, 1H) 8.03 (d, J = 9.00 Hz, 1H) 7.3

(400 MHz, DMSO-d₆) 1.86-1.99 (m, 1H) 2.12-2.26 (m, 1H) 3.00 (s, 2H) 3.41 (dd, J = 10.56, 5.67 Hz, 1H) 3.49-3.65 (m, 1H) 3.72 (dd, J = 10.37, 6.46 Hz, 1H) 4.00 (br. s., 1H) 4.28-4.46 (m, 3H) 6.79 (d, J = 8.80 Hz, 1H) 7.21 (t, J = 7.24 Hz, 1H) 7.42 (br. s., 1H) 7.46-7.61 (m, 1H) 7.71 (d, J = 8.02 Hz, 1H) 7.96 (d, J = 2.35 Hz, 1H) 8.00 (d, J = 2.54 Hz, 1H) 8.04 (d, J = 8.80 Hz, 1H) 7.4

(400 MHz, DMSO-d₆) 1.19 (t, J = 7.04 Hz, 3H) 1.90 (dq, J = 12.57, 6.57 Hz, 1H) 2.06-2.19 (m, 1H) 3.36 (dd, J = 10.56, 4.89 Hz, 1H) 3.48-3.57 (m, 1H) 3.58-3.67 (m, 1H) 3.70 (dd, J = 10.47, 6.16 Hz, 1H) 4.03 (q, J = 7.04 Hz, 2H) 4.08-4.20 (m, 1H) 4.32-4.52 (m, 4H) 6.85 (d, J = 8.61 Hz, 1H) 7.27 (t, J = 7.04 Hz, 1H) 7.47 (d, J = 6.26 Hz, 1H) 7.53-7.67 (m, 2H) 7.76 (d, J = 7.82 Hz, 1H) 7.96 (d, J = 2.54 Hz, 1H) 8.01 (d, J = 2.54 Hz, 1H) 8.11 (d, J = 8.41 Hz, 1H) 7.5

(400 MHz, DMSO-d₆) 1.88-2.01 (m, 1H) 2.04-2.19 (m, 1H) 3.31 (s, 3H) 3.44 (dd, J = 10.37, 5.48 Hz, 1H) 3.48-3.63 (m, 2H) 3.68 (dd, J = 10.27, 6.55 Hz, 1H) 3.83 (s, 2H) 4.29- 4.44 (m, 5H) 6.78 (d, J = 9.00 Hz, 1H) 7.21 (t, J = 7.34 Hz, 1H) 7.47-7.59 (m, 2H) 7.70 (d, J = 8.02 Hz, 1H) 7.94 (d, J = 2.54 Hz, 1H) 7.99 (d, J = 2.54 Hz, 1H) 8.03 (d, J = 8.80 Hz, 2H)

Examples 8.1 and 8.2 Example 8.1 2-(3-(3-(1,4-diazepan-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline

To a round bottomed flask was added tert-butyl 4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-1,4-diazepane-1-carboxylate (0.5340 g, 1.159 mmol, SCHEME 6, Example 6.15) and HCl, (1.0 M solution in diethyl ether (1.159 ml, 1.159 mmol)) and the reaction was allowed to stir at RT. After 1 h, the reaction mixture was concentrated, then diluted with saturated Na₂CO₃ and extracted with CH₂Cl₂. The organic extract was washed with saturated Na₂CO₃, saturated NaCl, dried over MgSO₄, filtered and concentrated in vacuo to give 2-(3-(3-(1,4-diazepan-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline (0.3627 g, 1.006 mmol, 87% yield).

ESI-MS (M+1): 361.1. PDE10 IC₅₀ (μM): 0.050.

Example 8.2 Methyl 4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-1,4-diazepane-1-carboxylate

To a round bottomed flask was added 2-(3-(3-(1,4-diazepan-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline (0.0772 g, 0.214 mmol), pyridine (commercially available through Aldrich, 0.035 ml, 0.428 mmol), and 4-(pyrrolidin-1-yl)pyridine (commercially available through Alfa Aesar, 0.032 g, 0.214 mmol) and the reaction was allowed to stir at RT in DCM (0.714 ml). Methyl carbonochloridate (commercially available through Aldrich, 0.021 ml, 0.321 mmol) was added and allowed to stir overnight. Upon completion, the solvent was evaporated. The crude product was adsorbed onto a plug of silica gel and chromatographed through a Biotage 50 g SNAP HP-silica column, eluting with a gradient of 0.5% to 5% MeOH in CH₂CL₂, to provide methyl 4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-1,4-diazepane-1-carboxylate (0.0632 g, 0.151 mmol, 70.5% yield). ESI-MS (M+1): 419.0. PDE10 IC₅₀ (μM): 0.0046.

The following Table 20 lists NMR data of Examples 8.1 to 8.2, which were made as described in the above Scheme 8.

TABLE 20 1H NMR δ (PPM) DATA FOR EXAMPLES 8.1 TO 8.2 Ex. # Structure NMR 8.1

(400 MHz, DMSO-d₆) 1.86 (t, J = 5.58 Hz, 1 H) 2.85 (t, J = 5.77 Hz, 1 H) 2.93-3.03 (m, 1 H) 3.41-3.53 (m, 2 H) 4.19-4.34 (m, 2 H) 4.38-4.47 (m, 2 H) 6.79 (d, J = 8.80 Hz, 1 H) 7.21 (t, J = 7.34 Hz, 1 H) 7.46-7.61 (m, 1 H) 7.71 (d, J = 7.82 Hz, 1 H) 8.03 (d, J = 2.54 Hz, 2 H) 8.2

(400 MHz, DMSO-d₆) 1.93 (br. s., 2 H) 3.42 (br. s., 2 H) 3.48 (br. s., 2 H) 3.53 (d, J = 4.69 Hz, 2 H) 3.56-3.65 (m, 5 H) 4.21- 4.35 (m, 3 H) 4.41-4.51 (m, 2 H) 6.81 (d, J = 9.00 Hz, 1 H) 7.19-7.27 (m, 1 H) 7.49- 7.62 (m, 2 H) 7.73 (d, J = 7.82 Hz, 1 H) 8.05 (d, J = 8.80 Hz, 1 H) 8.11 (dd, J = 12.52, 2.54 Hz, 2 H)

Example 9.1 N-methyl-methyl(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate Step 1. N-methyl-1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-amine

To a round bottomed flask was added tert-butyl methyl(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate (3.0 g, 6.51 mmol) and hydrogen chloride, 5-6N in isopropanol (0.237 g, 6.51 mmol) to stir overnight. Solvent was evaporated and the reaction mixture was diluted with water and extracted with EtOAc. The organic extract was washed with water, saturated Na₂CO₃, saturated NaCl, and dried over MgSO4, filtered and concentrated in vacuo to give N-methyl-1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-amine (1.0339 g, 2.87 mmol, 44.0% yield). ¹H NMR (400 MHz, DMSO-d₆) δ ppm 1.71-1.83 (m, 1H) 2.02 (dt, J=12.18, 5.94 Hz, 1H) 2.32 (s, 2H) 3.16-3.28 (m, 1H) 3.32 (br. s., 1H) 3.42-3.52 (m, 1H) 3.54-3.67 (m, 1H) 4.29-4.45 (m, 4H) 6.78 (d, J=8.80 Hz, 1H) 7.17-7.25 (m, 1H) 7.48-7.59 (m, 2H) 7.71 (d, J=7.83 Hz, 1H) 7.91 (d, J=2.54 Hz, 1H) 7.97 (d, J=2.35 Hz, 1H) 8.03 (d, J=8.80 Hz, 1H)

Step 2. N-methyl-methyl(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate

14 Mar. 2011 To a round bottomed flask was added N-methyl-1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-amine (0.0999 g, 0.277 mmol), pyridine (0.045 ml, 0.554 mmol), and 4-(pyrrolidin-1-yl)pyridine (0.041 g, 0.277 mmol) to stir at RT in DCM (0.924 ml). Methyl carbonochloridate (0.027 ml, 0.416 mmol) was added and allowed to stir for 2 h. Solvent was evaporated and the crude product was adsorbed onto a plug of silica gel and chromatographed through a Biotage 50 g SNAP HP-silica column, eluting with a gradient of 1% to 4% MeOH in CH₂Cl₂, to provide methyl methyl(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate (0.0307 g, 0.073 mmol, 26.5% yield).

The following Table 21A lists compounds of Examples 9.1 to 9.3, which were made analogous to Scheme 9 by using the appropriate materials and reaction conditions, which are listed in Table 21B. The NMR data of the Examples are listed in Table 21C.

TABLE 21A EXAMPLES 9.1 TO 9.3 ESI-MS IC₅₀ Ex. # Structure Chemical Name (M + 1) (uM) 9.1

N-methyl-methyl(1-(3-(1- (quinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)pyrrolidin-3- yl)carbamate 419.0 0.00052 9.2

N-methyl-N-(1-(3-(1-(quinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)pyrrolidin-3- yl)methanesulfonamide 439.0 0.00568 9.3

Ethyl methyl(1-(3-(1-(quinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)pyrrolidin-3-yl)carbamate 433.1 0.002

TABLE 21B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 9.1 TO 9.3. Unless otherwise stated, all starting materials are commercially available from common vendors. Reaction Purification Ex. # Starting Material 1 Starting Material 2 Condition Condition* 9.1

4-PPY, Py, DCM A 9.2

4-PPY, Py, DCM A 9.3

4-PPY, Py, DCM A *Purification condition: Method A: flash column chromatography on silica gel using Biotage 50 g SNAP HP-silica column, eluting with a gradient of 1% to 4% MeOH in CH₂Cl₂

TABLE 21C 1H NMR δ (PPM) DATA FOR EXAMPLES 9.1 TO 9.3 Ex. # Structure NMR 9.1

(400 MHz, DMSO-d₆) 2.09 (q, J = 6.91 Hz, 2 H) 2.86 (s, 3 H) 3.49-3.61 (m, 4 H) 3.64 (s, 3 H) 4.31-4.41 (m, 4 H) 4.41-4.51 (m, 1 H) 6.79 (d, J = 8.80 Hz, 1 H) 7.22 (t, J = 6.85 Hz, 1 H) 7.48-7.60 (m, 2 H) 7.71 (d, J = 7.82 Hz, 1 H) 7.96-8.07 (m, 3 H) 9.2

(400 MHz, DMSO-d₆) 2.03-2.20 (m, 1 H) 2.83 (s, 2 H) 2.99 (s, 2 H) 3.49-3.61 (m, 2 H) 4.31-4.51 (m, 3 H) 6.79 (d, J = 9.00 Hz, 1 H) 7.21 (t, J = 6.85 Hz, 1 H) 7.46- 7.60 (m, 1 H) 7.71 (d, J = 7.82 Hz, 1 H) 7.96-8.06 (m, 2 H) 9.3

(400 MHz, DMSO-d₆) 1.21 (t, J = 7.14 Hz, 2 H) 2.08 (q, J = 7.50 Hz, 1 H) 2.85 (s, 2 H) 3.48-3.61 (m, 2 H) 4.08 (q, J = 7.04 Hz, 1 H) 4.29-4.40 (m, 2 H) 4.40-4.49 (m, 1 H) 4.72 (br. s., 1 H) 6.79 (d, J = 9.00 Hz, 1 H) 7.21 (t, J = 7.24 Hz, 1 H) 7.47-7.60 (m, 1 H) 7.70 (d, J = 7.82 Hz, 1 H) 7.95-8.06 (m, 2 H)

Example 10.1 2-(3-(3-(4-chlorophenyl)pyrazin-2-yl)azetidin-1-yl)quinazoline

2M aqueous sodium carbonate (0.378 mL, 0.756 mmol, J. T. Baker) was added to a stirred mixture of 2-(3-(3-chloropyrazin-2-yl)azetidin-1-yl)quinazoline (0.075 g, 0.252 mmol, Preparation 1), trans-dichlorobis(triphenylphosphine)palladium (ii) (0.009 g, 0.013 mmol, Strem), and 4-chlorophenylboronic acid (0.047 g, 0.302 mmol, ASDI) in 1,4-dioxane (1 mL) in a sealed tube under an argon atmosphere. The reaction mixture was stirred at 80° C. for 17 h. The reaction mixture was concentrated in vacuo and diluted with DCM. The resulting suspension was filtered, and the filtrate was concentrated in vacuo. The resulting crude material was purified via reverse phase HPLC (Column: Xbridge 19×100 mm, 5 μm, 1771302301) eluting with 0.1% NH₄OH in acetonitrile/water to give 0.060 g (64%) of a yellow amorphous solid.

¹H NMR (500 MHz, DMSO-d₆) δ ppm 4.28-4.38 (m, 5H) 7.25-7.30 (m, 1H) 7.52 (d, J=8.48 Hz, 1H) 7.62 (s, 4H) 7.70-7.75 (m, 1H) 7.84 (br. d, J=7.80 Hz, 1H) 8.64 (d, J=2.41 Hz, 1H) 8.70 (d, J=2.41 Hz, 1H) 9.18 (s, 1H). ESI (M+1) 374.0; calc for C₂₁H₁₆ClN₅ 373.

The following Table 22A lists compounds of Examples 10.1 to 10.20, which were made analogous to Scheme 10 by using the appropriate materials and reaction conditions, which are listed in Table 22B. The NMR data of the Examples are listed in Table 22C.

TABLE 22A EXAMPLES 10.1 TO 10.20 ESI-MS Ex. # Structure Chemical Name (M + 1) IC₅₀ (μM) 10.1

2-(3-(3-(4- chlorophenyl)pyrazin-2- yl)azetidin-1-yl)quinazoline 374.0 0.00482 10.2

2-(3-(3-(3- chlorophenyl)pyrazin-2- yl)azetidin-1-yl)quinazoline 374.0 0.00615 10.3

2-(3-(3-(2- chlorophenyl)pyrazin-2- yl)azetidin-1-yl)quinazoline 374.0 0.0309 10.4

2-(3-(3-(o-tolyl)pyrazin-2- yl)azetidin-1-yl)quinazoline 354.2 0.0178 10.5

1-(4-(3-(1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)phenyl)ethanone 382.2 0.00738 10.6

1-(3-(3-(1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)phenyl)ethanone 382.2 0.00136 10.7

N-(3-(3-(1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)phenyl)acetamide 397.2 0.000635 10.8

N-(4-(3-(1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)phenyl)methanesulfonamide 433.2 0.00336 10.9

N-(3-(3-(1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)phenyl)methanesulfonamide 433.2 0.00959 10.10

2-(3-(3-(1H-indol-6-yl)pyrazin- 2-yl)azetidin-1-yl)quinazoline 379.2 0.00525 10.11

2-(3-(3-(1-methyl-1H-indol-5- yl)pyrazin-2-yl)azetidin-1- yl)quinazoline 393.2 0.00595 10.12

2-(3-(3-(1-methyl-1H-indol-6- yl)pyrazin-2-yl)azetidin-1- yl)quinazoline 393.2 0.00298 10.13

5-(3-(1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)indolin-2-one 395.2 0.00946 10.14

1-methyl-5-(3-(1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)indolin-2-one 409.2 0.018 10.15

1-methyl-6-(3-(1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2-yl)- 1H-benzo[d]imidazol-2(3H)- one 410.2 0.0042 10.16

2-fluoro-4-(3-(1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)aniline 373.1 0.00682 10.17

2-(3-(3-(p-tolyl)pyrazin-2- yl)azetidin-1-yl)quinazoline 354.2 0.00708 10.18

2-methyl-6-(3-(1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)isoquinolin-1(2H)-one 421.1 0.01739 10.19

2-(3-(3-(1H-indazol-5- yl)pyrazin-2-yl)azetidin-1- yl)quinazoline 380.1 0.01216 10.20

5-(3-(1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)benzo[d]thiazole 397.1 0.0044

TABLE 22B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 10.1 TO 10.20. Unless otherwise stated, all starting materials are commercially available from common vendors. Reaction Purification Ex. # Key Starting Material(s) Key Starting Material(s) Condition Method* 10.1

Dioxane/water, 80° C., 17 h A 10.2

Dioxane/water, 80° C., 17 h A 10.3

Dioxane/water, 80° C., 17 h A 10.4

Dioxane/water, 80° C., 17 h A 10.5

Dioxane/water, 80° C., 17 h A 10.6

Dioxane/water, 80° C., 17 h A 10.7

Dioxane/water, 80° C., 17 h A 10.8

Dioxane/water, 80° C., 17 h A 10.9

Dioxane/water, 80° C., 17 h A 10.10

Dioxane/water, 80° C., 17 h A 10.11

Dioxane/water, 80° C., 17 h A 10.12

Dioxane/water, 80° C., 15 h A 10.13

Dioxane/water, 80° C., 15 h A 10.14

Dioxane/water, 80° C., 15 h A 10.15

Dioxane/water, 80° C., 15 h A 10.16

Pd₂Cl₂(PPh₃)₂, Na₂CO₃, (4 equiv), Dioxane/water, 80° C., 17 h B 10.17

Pd₂Cl₂(PPh₃)₂, Na₂CO₃, Dioxane/water, 80° C., 17 h B 10.18

Pd₂Cl₂(PPh₃)₂, Na₂CO₃, Dioxane/water, 80° C., 17 h B 10.19

Pd₂Cl₂(PPh₃)₂, Na₂CO₃, Dioxane/water, 80° C., 17 h B 10.20

Pd₂Cl₂(PPh₃)₂, Na₂CO₃, Dioxane/water, 80° C., 17 h A, B *Purification Methods: Method A—reverse phase HPLC (Column: Xbridge 19x100 mm, 5 μm, 1771302301) eluting with 0.1% NH₄OH in acetonitrile/water. Method B—silica gel flash column chromatography eluting with 0% to 75% EtOAc in hexanes

TABLE 22C 1H NMR δ (PPM) DATA FOR EXAMPLES 10.1 TO 10.20 Ex. # Structure NMR 10.1

(500 MHz, DMSO-d₆) 4.28-4.38 (m, 5 H) 7.25-7.30 (m, 1 H) 7.52 (d, J = 8.48 Hz, 1 H) 7.62 (s, 4 H) 7.70-7.75 (m, 1 H) 7.84 (br. d, J = 7.80 Hz, 1 H) 8.64 (d, J = 2.41 Hz, 1 H) 8.70 (d, J = 2.41 Hz, 1 H) 9.18 (s, 1 H) 10.2

(500 MHz, DMSO-d₆) 4.28-4.40 (m, 5 H) 7.28 (t, J = 7.40 Hz, 1 H) 7.50-7.62 (m, 4 H) 7.66 (s, 1 H) 7.70-7.75 (m, 1 H) 7.84 (d, J = 7.79 Hz, 1 H) 8.64 (d, J = 2.40 Hz, 1 H) 8.71 (d, J = 2.40 Hz, 1 H) 9.18 (s, 1 H) 10.3

(500 MHz, DMSO-d₆) 3.96 (quin, J = 7.30 Hz, 1 H) 4.33 (m, 4 H) 7.28 (t, J = 7.39 Hz, 1 H) 7.50-7.59 (m, 4 H) 7.66 (br. d, J = 7.45 Hz, 1 H) 7.70-7.75 (m, 1 H) 7.84 (d, J = 7.56 Hz, 1 H) 8.67 (d, J = 2.41 Hz, 1 H) 8.76 (d, J = 2.52 Hz, 1 H) 9.18 (s, 1 H) 10.4

(500 MHz, DMSO-d₆) 2.07 (s, 3 H) 3.94- 4.01 (m, 1 H) 4.22 (t, J = 8.36 Hz, 2 H) 4.28- 4.33 (m, 2 H) 7.23-7.30 (m, 2 H) 7.32-7.37 (m, 1 H) 7.37-7.44 (m, 2 H) 7.51 (d, J = 8.48 Hz, 1 H) 7.70-7.74 (m, 1 H) 7.84 (d, J = 7.56 Hz, 1 H) 8.63 (d, J = 2.52 Hz, 1 H) 8.70 (d, J = 2.41 Hz, 1 H) 9.17 (s, 1 H) 10.5

(500 MHz, DMSO-d₆) 2.67 (s, 3 H) 4.29- 4.39 (m, 5 H) 7.28 (br. t, J = 7.40, 7.40 Hz, 1 H) 7.51 (d, J = 8.25 Hz, 1 H) 7.71-7.77 (m, 3 H) 7.85 (br. d, J = 8.00 Hz, 1 H) 8.13 (d, J = 8.36 Hz, 2 H) 8.68 (d, J = 2.41 Hz, 1 H) 8.73 (d, J = 2.41 Hz, 1 H) 9.18 (s, 1 H) 10.6

(500 MHz, DMSO-d₆) 2.67 (s, 3 H) 4.30- 4.40 (m, 5 H) 7.27 (t, J = 7.39 Hz, 1 H) 7.51 (d, J = 8.48 Hz, 1 H) 7.71 (t, J = 7.68 Hz, 2 H) 7.83 (d, J = 8.02 Hz, 1 H) 7.86 (d, J = 7.68 Hz, 1 H) 8.10 (d, J = 7.79 Hz, 1 H) 8.13 (s, 1 H) 8.66 (d, J = 2.29 Hz, 1 H) 8.72 (d, J = 2.29 Hz, 1 H) 9.17 (s, 1 H) 10.7

(500 MHz, DMSO-d₆) 2.09 (s, 3 H) 4.29- 4.45 (m, 5 H) 7.26-7.30 (m, 2 H) 7.48 (t, J = 7.85 Hz, 1 H) 7.53 (d, J = 8.48 Hz, 1 H) 7.67 (br. d, J = 8.00 Hz, 1 H) 7.71-7.75 (m, 1 H) 7.83-7.87 (m, 2 H) 8.63 (d, J = 2.41 Hz, 1 H) 8.68 (d, J = 2.41 Hz, 1 H) 9.19 (s, 1 H) 10.13 (s, 1 H) 10.8

(500 MHz, DMSO-d₆) 3.10 (s, 3 H) 4.27- 4.32 (m, 2 H) 4.36-4.42 (m, 3 H) 7.28 (br. t, J = 7.40, 7.40 Hz, 1 H) 7.38 (d, J = 8.59 Hz, 2 H) 7.52 (d, J = 8.48 Hz, 1 H) 7.57 (d, J = 8.59 Hz, 2 H) 7.71-7.75 (m, 1 H) 7.85 (br. d, J = 8.00 Hz, 1 H) 8.61 (d, J = 2.40 Hz, 1 H) 8.65 (d, J = 2.41 Hz, 1 H) 9.18 (s, 1 H) 10.05 (s, 1 H) 10.9

(500 MHz, DMSO-d₆) 3.07 (s, 3 H) 4.30- 4.37 (m, 3 H) 4.38-4.44 (m, 2 H) 7.29 (br. t, J = 7.50, 7.50 Hz, 1 H) 7.33-7.39 (m, 3 H) 7.51-7.55 (m, 2 H) 7.71-7.75 (m, 1 H) 7.86 (br. d, J = 8.10 Hz, 1 H) 8.64 (d, J = 2.41 Hz, 1 H) 8.70 (d, J = 2.41 Hz, 1 H) 9.19 (s, 1 H) 9.97 (s, 1 H) 10.10

(500 MHz, DMSO-d₆) 4.30-4.40 (m, 4 H) 4.42-4.49 (m, 1 H) 6.52-6.54 (m, 1 H) 7.24 (dd, J = 8.25, 1.49 Hz, 1 H) 7.27 (m, J = 7.80, 7.80 Hz, 1 H) 7.49 (t, J = 2.75 Hz, 1 H) 7.51 (d, J = 8.48 Hz, 1 H) 7.61 (s, 1 H) 7.68-7.74 (m, 2 H) 7.82-7.86 (m, 1 H) 8.62 (d, J = 2.40 Hz, 1 H) 8.63 (d, J = 2.40 Hz, 1 H) 9.17 (s, 1 H) 11.30 (br. s., 1 H) 10.11

(500 MHz, DMSO-d₆) 3.87 (s, 3 H) 4.25- 4.36 (m, 4 H) 4.45-4.52 (m, 1 H) 6.57 (d, J = 2.86 Hz, 1 H) 7.27 (br. t, J = 7.40, 7.40 Hz, 1 H) 7.39 (dd, J = 8.42, 1.55 Hz, 1 H) 7.44 (d, J = 2.98 Hz, 1 H) 7.50 (d, J = 8.59 Hz, 1 H) 7.60 (d, J = 8.48 Hz, 1 H) 7.69-7.73 (m, 1 H) 7.77 (d, J = 1.26 Hz, 1 H) 7.83 (br. d, J = 7.10 Hz, 1 H) 8.60-8.63 (m, 2H) 9.16 (s, 1 H) 10.12

(500 MHz, DMSO-d₆) 3.88 (s, 3 H) 4.28- 4.38 (m, 4 H) 4.47-4.54 (m, 1 H) 6.53 (d, J = 2.86 Hz, 1 H) 7.24-7.29 (m, 2 H) 7.47 (d, J = 3.09 Hz, 1 H) 7.51 (d, J = 8.48 Hz, 1 H) 7.64 (s, 1 H) 7.70 (m, J = 8.40 Hz, 2 H) 7.83 (br. d, J = 7.80 Hz, 1 H) 8.63 (d, J = 2.40 Hz, 1 H) 8.65 (d, J = 2.40 Hz, 1 H) 9.16 (s, 1 H) 10.13

(500 MHz, DMSO-d₆) 3.60 (s, 2 H) 4.26- 4.31 (m, 2 H) 4.36-4.45 (m, 3 H) 6.98 (d, J = 8.02 Hz, 1 H) 7.26-7.30 (m, 1 H) 7.41 (d, J = 8.02 Hz, 1 H) 7.44 (s, 1 H) 7.51 (d, J = 8.48 Hz, 1 H) 7.70-7.75 (m, 1 H) 7.85 (br. d, J = 7.20 Hz, 1 H) 8.59 (d, J = 2.29 Hz, 1 H) 8.62 (d, J = 2.41 Hz, 1 H) 9.18 (s, 1 H) 10.57 (s, 1 H) 10.14

(500 MHz, DMSO-d₆) 3.20 (s, 3 H) 3.68 (s, 2 H) 4.27-4.32 (m, 2 H) 4.35-4.41 (m, 2 H) 4.41-4.48 (m, 1 H) 7.14 (d, J = 7.90 Hz, 1 H) 7.28 (br. t, J = 7.50, 7.50 Hz, 1 H) 7.49-7.53 (m, 3 H) 7.70-7.75 (m, 1 H) 7.85 (br. d, J = 7.20 Hz, 1 H) 8.60 (d, J = 2.41 Hz, 1 H) 8.63 (d, J = 2.41 Hz, 1 H) 9.18 (s, 1 H) 10.15

(500 MHz, DMSO-d₆) 3.35 (s, 3 H) 4.27- 4.32 (m, 2 H) 4.34-4.40 (m, 2 H) 4.43-4.50 (m, 1 H) 7.14 (d, J = 7.90 Hz, 1 H) 7.21 (dd, J = 8.00, 1.50 Hz, 1 H) 7.28 (t, J = 7.45 Hz, 1 H) 7.30 (s, 1 H) 7.51 (d, J = 8.48 Hz, 1 H) 7.70- 7.74 (m, 1 H) 7.84 (br. d, J = 7.90 Hz, 1 H) 8.61 (d, J = 2.41 Hz, 1 H) 8.64 (d, J = 2.40 Hz, 1 H) 9.18 (s, 1 H) 11.05 (s, 1 H) 10.16

(500 MHz, d-CHLOROFORM) 3.98 (br. s., 2 H) 4.41 (quin, J = 7.20 Hz, 1 H) 4.53 (d, J = 7.20 Hz, 4 H) 6.88 (t, J = 8.61 Hz, 1 H) 7.11 (br. d, J = 8.00 Hz, 1 H) 7.20-7.27 (m, 2 H) 7.60- 7.70 (m, 3 H) 8.49 (d, J = 2.15 Hz, 1 H) 8.52 (d, J = 2.15 Hz, 1 H) 9.02 (s, 1 H) 10.17

(500 MHz, d-CHLOROFORM) 2.45 (s, 3 H) 4.37 (quin, J = 7.20 Hz, 1 H) 4.45-4.57 (m, 4 H) 7.23 (t, J = 7.34 Hz, 1 H) 7.32 (d, ¹H NMR (500 MHz, d-CHLOROFORM) δ J = 8.02 Hz, 2 H) 7.41 (d, J = 8.00 Hz, 2 H) 7.60-7.70 (m, 3 H) 8.52 (d, J = 2.20 Hz, 1 H) 8.56 (d, J = 2.15 Hz, 1 H) 9.01 (s, 1 H) 10.18

(500 MHz, d-CHLOROFORM) 3.66 (s, 3 H) 4.36 (quin, J = 7.40 Hz, 1 H) 4.46-4.59 (m, 4 H) 6.55 (d, J = 7.43 Hz, 1 H) 7.16 (d, J = 7.43 Hz, 1 H) 7.24 (t, J = 7.40 Hz, 1 H) 7.59-7.71 (m, 5 H) 8.56-8.60 (m, 2 H) 8.65 (d, J = 2.15 Hz, 1 H) 9.01 (s, 1 H) 10.19

(500 MHz, d-CHLOROFORM) 4.40-4.59 (m, 5 H) 7.21-7.25 (m, 1 H) 7.54-7.70 (m, 5 H) 7.90 (s, 1 H) 8.17 (s, 1 H) 8.56 (d, J = 2.30 Hz, 1 H) 8.60 (d, J = 2.35 Hz, 1 H) 9.01 (s, 1 H) 10.53 (br. s, 1 H) 10.20

(400 MHz, d-CHLOROFORM) 4.42-4.59 (m, 5 H) 7.23 (t, J = 7.43 Hz, 1 H) 7.59-7.71 (m, 4 H) 8.13 (d, J = 8.41 Hz, 1 H) 8.29 (d, J = 0.78 Hz, 1 H) 8.59 (d, J = 2.35 Hz, 1 H) 8.64 (d, J = 2.35 Hz, 1 H) 9.01 (s, 1 H) 9.11 (s, 1 H)

Example 11.1 (1H-benzoimidazol-2-yl)-(3-{3-[4-(1-hydroxy-ethyl)-phenyl]-pyrazin-2-yl}-azetidin-1-yl)-methanone

1-(4-{3-[1-(1H-benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-phenyl)-ethanone (100 mg, 0.25 mmol, Scheme 2, Example 2.21) was dissolved in 10 ml of methanol. This solution was cooled down to 0° C. using an ice bath and sodium tetraborohydride (19 mg, 0.50 mmol) was added by portions. The reaction mixture was stirred for 4 h at ambient temperature, then saturated aqueous solution of ammonium chloride (5 mL) was added. The methanol was evaporated off under reduced pressure then the reaction mixture was taken up in ethyl acetate. The organic phase was separated from the aqueous phase. This extraction was repeated one more time and then the organic phases were combined and dried over magnesium sulphate, followed by concentrating under reduced pressure. The residue was purified by column chromatography to give the title compound (75 mg, 0.19 mmol, 75% yield).

The following Table 23A lists compounds of Examples 11.1 to 11.3, which were made analogous to Scheme 11 by using the appropriate materials and reaction conditions, which are listed in Table 23B. The NMR data of the Examples are listed in Table 23C.

TABLE 23A EXAMPLES 11.1 TO 11.3 ESI-MS IC₅₀ Ex. # Structure Chemical Name (M + 1) (uM) 11.1

(R & S)-(1H-Benzoimidazol-2- yl)-(3-{3-[4-(1-hydroxy-ethyl)- phenyl]-pyrazin-2-yl}-azetidin- 1-yl)-methanone 400 0.0288 11.2

(R & S)-(1H-Benzoimidazol-2- yl)-(3-{3-[3-(1-hydroxy-ethyl)- phenyl]-pyrazin-2-yl}-azetidin- 1-yl)-methanone 400 0.0778 11.3

(R & S)-(1H-Benzoimidazol-2- yl)-(3-{3-[4-(1-hydroxy-ethyl)- piperidin-1-yl]-pyrazin-2-yl}- azetidin-1-yl)-methanone 407 0.056

TABLE 23B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 11.1 TO 11.3. Unless otherwise stated, all starting materials are commercially available from common vendors. Ex. # Starting Material 1 Reaction Condition 11.1

NaBH₄, MeOH 0° C. 11.2

NaBH₄, MeOH 0° C. 11.3

NaBH₄, MeOH 0° C.

TABLE 23C 1H NMR δ (PPM) DATA FOR EXAMPLES 11.1 TO 11.3 Ex. # Structure NMR 11.1

(DMSO, 400 MHz): 8.65 (d, J = 2.4 Hz, 1H); 8.54 (d, J = 2.4 Hz, 1H); 7.67-7.65 (m, 2 H); 7.56-7.54 (m, 2H); 7.49-7.47 (m, 2H); 7.37-7.34 (m, 2H); 4.99-4.98 (m, 2H); 4.91-4.90 (m, 1H); 4.42-4.39 (m, 3H); 1.49 (d, J = 6.4 Hz, 3H). 11.2

(CDCl₃, 400 MHz): 8.44 (s, 2 H); 7.51 (brs, 2H); 7.36-7.35 (m, 3H); 7.23-7.19 (m, 3H); 4.91-4.90 (m, 3H); 4.39-4.13 (m, 3H); 1.43 (d, J = 6.0 Hz, 3H). 11.3

(CD₃OD, 400 MHz): 8.17 (d, J = 2.4 Hz, 1H); 8.11 (d, J = 2.4 Hz, 1H); 7.67 (m, 2H), 7.26 (m, 2H); 5.18 (t, J = 7.6, 1H); 4.96(m, 1H); 4.62 (t, J = 8.0 Hz, 1H); 4.46-4.40 (m, 1H); 4.42-4.36 (m, 1H); 3.61-3.53 (m, 1H); 3.45 (d, J = 8.4 Hz, 2H); 2.2.89-2.79 (m, 1H); 2.01-1.75 (m, 2H); 1.61-1.42 (m, 2H) 1.38 (d, J = 6.4 Hz, 1H); 1.19(d, J = 6.4 Hz, 3H).

Example 12.1 1-(4-{3-[1-(1H-benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-1-yl)-ethanone Step 1. 4-{3-[1-(1H-benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester

To a mixture of (1H-Benzoimidazol-2-yl)-[3-(3-chloro-pyrazin-2-yl)-azetidin-1-yl]-methanone (188 mg, 0.6 mmol) in 1,4-dioxane/water (5:1, 12 mL) was added 4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (278 mg, 0.9 mmol), K₃PO₄ (254 mg, 1.2 mmol) and Pd(dppf)Cl₂ (44 mg, 0.06 mmol). The mixture was refluxed overnight. The reaction mixture was filtered and concentrated. The residue was purified by ISCO silica gel column (10% to 80% EtOAc in petroleum ether) to give 4-{3-[1-(1H-benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (221 mg, 0.48 mmol, yield 80%). ESI-MS (M+1): 461 calc. for C₂₅H₂₈N₆O₃ 460.

Step 2. (1H-benzoimidazol-2-yl)-{3-[3-(1,2,3,6-tetrahydro-pyridin-4-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone hydrochloride

To 4-{3-[1-(1H-Benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (217 mg, 0.47 mmol) was added 4 M HCl in MeOH (100 mL). The solution was stirred at RT for 2 h. The solvent was removed under reduced pressure to give (1H-benzoimidazol-2-yl)-{3-[3-(1,2,3,6-tetrahydro-pyridin-4-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone hydrochloride (187 mg, 0.47 mmol, yield 100%). ESI-MS (M+1): 361 calc. for C₂₀H₂₀N₆O 360.

Step 3. 1-(4-{3-[1-(1H-benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-3,6-dihydro-2H-pyridin-1-yl)-ethanone

To a solution of (1H-benzoimidazol-2-yl)-{3-[3-(1,2,3,6-tetrahydro-pyridin-4-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone hydrochloride (187 mg, 0.47 mmol) in dry CH₂Cl₂ (10 mL) was added Et₃N (1 mL). The reaction mixture was cooled to 0° C. with an ice bath, and acetyl chloride (39 mg, 0.50 mmol) was added dropwise. After 1 h, the reaction mixture was warmed to RT, and stirred overnight. Then the reaction mixture was washed with brine, dried over Na₂SO₄, filtered, and concentrated under vacuum to give the crude product (170 mg, 0.42 mmol, 90% yield). ESI-MS (M+1): 403 calc. for C₂₂H₂₂N₆O₂ 402.

Step 4. 1-(4-{3-[1-(1H-benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-1-yl)-ethanone

A mixture of 1-(4-{3-[1-(1H-benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-3,6-dihydro-2H-pyridin-1-yl)-ethanone (170 mg, 0.42 mmol) and wet Pd—C (50%, 50 mg) in MeOH (30 mL) was stirred under H₂ (30 psi) at RT for 2 h then the reaction mixture was filtered through CELITE® and washed with MeOH. The filtrate was concentrated in vacuo and the residue was purified by ISCO silica gel column (10% to 50% EtOAc in petroleum ether) to give 1-(4-{3-[1-(1H-benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-1-yl)-ethanone (101 mg, 0.25 mmol, 60% yield).

¹H NMR (CDCl₃, 400 MHz): δ (ppm) 8.44 (dd, J=2.4, 4.0 Hz, 2H); 7.23-7.22 (m, 2H); 7.39-7.37 (m, 2H); 5.36-5.34 (m, 1H); 5.08-5.05 (m, 1H); 4.81-4.62 (m, 3H); 4.41-4.38 (m, 1H); 4.01 (d, J=13.2 Hz, 1H); 3.28-3.26 (m, 1H); 3.06-3.01 (m, 1H); 2.79-2.77 (m, 1H); 2.20 (s, 3H); 2.04-2.01 (m, 1H); 1.88-1.75 (m, 3H).

ESI-MS (M+1): 405. PDE10 IC₅₀ (uM): 0.427.

Examples 13.1 and 13.2

Step 1. (1H-benzoimidazol-2-yl)-{3-[3-(4-hydroxy-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone

To a mixture of (1H-benzoimidazol-2-yl)-[3-(3-chloro-pyrazin-2-yl)-azetidin-1-yl]-methanone (0.170 g, 0.50 mmol) and piperidin-4-ol (0.101 g, 1.0 mmol) was added triethylamine (0.10 g, 1.0 mmol) and DMSO (4 mL). The solution was heated to 120° C. for 4 h. Then the mixture was diluted with water (10 mL) and extracted with EtOAc (2×20 mL). The combined organic extracts were washed with water (10 mL) and brine (10 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel (20% to 50% EtOAc in petroleum ether) to give (1H-benzoimidazol-2-yl)-{3-[3-(4-hydroxy-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone (0.16 g, 0.42 mmol, 85% yield) as a white solid.

ESI-MS (M+1): 379 calc. for C₂₀H₂₂N₆O₂ 378.

Step 2. 1-{3-[1-(1H-benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-one

(1H-Benzoimidazol-2-yl)-{3-[3-(4-hydroxy-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone (0.16 g, 0.42 mmol) was dissolved in anhydrous CH₂Cl₂ (20 mL), treated with Dess-Martin Periodinane (DMP) (195 mg, 0.46 mmol, 1.1 equiv) and stirred at RT until complete conversion controlled by TLC (Petro ether:EtOAc=1:1). The organic layer was washed with an aqueous solution of NaHCO₃/Na₂S₂O₃ (3×10 mL)), dried over Na₂SO₄, filtered and evaporated. The resulting residue was purified by flash chromatography (20% to 40% EtOAc in petroleum ether) to give 1-{3-[1-(1H-benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-one (0.134 g, 0.36 mmol, 85% yield) as a white solid.

¹H NMR (CDCl₃, 400 MHz): δ (ppm) 8.24-8.14 (m, 2H); 7.71-7.68 (m, 2H); 7.35-7.24 (m, 2H); 5.34-5.30 (m, 1H); 5.08-5.04 (m, 1H); 4.69-4.60 (m, 2H); 4.39-4.31 (m, 1H); 3.55-3.44 (m, 4H); 2.67-2.57 (m, 4H).

ESI-MS (M+1): 377 calc. for C₂₀H₂₀N₆O₂ 376.

PDE10 IC₅₀ (uM): 0.0956.

Step 3. (1H-benzoimidazol-2-yl)-{3-[3-(4,4-difluoro-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone

In a 50 mL flask, 1-{3-[1-(1H-benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-one (0.134 g, 0.36 mmol) was dissolved in anhydrous CH₂Cl₂ (15 mL). The solution was cooled to −10° C. under nitrogen atmosphere and DAST (0.12 g, 0.72 mmol) was added dropwise. The reaction mixture was allowed to warm to RT and stirred for 2 h. The mixture was poured into cold water (10 mL). The separated aqueous phase was extracted twice with CH₂Cl₂ (20 mL), and the combined organic phases were dried over MgSO₄. After filtration, the solvent was evaporated in vacuo, and the concentrate was purified via flash chromatography on silica gel (20% to 45% EtOAc in petroleum ether) to give (1H-benzoimidazol-2-yl)-{3-[3-(4,4-difluoro-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone (0.114 g, 0.29 mmol, 80% yield) as a white solid.

¹H NMR (CDCl₃, 400 MHz): δ (ppm) 8.15 (d, J=1.6 Hz, 1H); 8.07 (d, J=2.4, 1H); 7.64-7.62 (m, 2H); 7.29-7.26 (m, 2H); 5.26-5.22 (m, 1H); 5.00-4.96 (m, 1H); 4.56-4.54 (m, 2H); 4.23-4.19 (m, 1H); 3.23-3.20 (m, 4H); 2.12-2.04 (m, 4H).

ESI-MS (M+1): 399 calc. for C₂₀H₂₀F₂N₆O 398.

PDE10 IC₅₀ (uM): 0.0765.

Example 14.1 (1H-benzoimidazol-2-yl)-{3-[3-(4-hydroxy-4-methyl-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone

To a solution of 1-{3-[1-(1H-benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-one (150 mg, 0.40 mol, SCHEME 13, Ex. 13.1) in 20 mL of THF was added CH₃MgBr (0.60 mol, 3 M in ether) dropwise at 0° C. The mixture was stirred for 1 h at RT and then quenched with saturated aqueous NH₄Cl. The resulting mixture was extracted with EtOAc (2×20 mL) and the combined organic layers were dried over anhydrous Na₂SO₄, filtered and concentrated to give crude product which was purified by prep. TLC (EtOAc:Petrol ether=1:1) to give (1H-benzoimidazol-2-yl)-{3-[3-(4-hydroxy-4-methyl-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone (0.109 g, 0.28 mmol, 70% yield) as a white solid.

¹H NMR (CD₃OD, 400 MHz): δ (ppm) 8.12 (d, J=2.8 Hz, 1H); 8.05 (d, J=2.8 Hz, 1H); 7.63-7.56 (m, 2H); 7.29-7.26 (m, 2H); 5.21-5.16 (m, 1H); 4.57-4.54 (m, 2H); 3.28-3.20 (m, 2H); 3.11-3.08 (m, 2H); 1.81-1.70 (m, 4H); 1.27 (s, 3H).

ESI-MS (M+1): 393. PDE10 IC₅₀ (uM): 0.131.

Example 15.1 (1H-benzoimidazol-2-yl)-[3-(5-phenyl-pyrimidin-4-yl)-azetidin-1-yl]-methanone Step 1. 3-(5-bromo-2-chloro-pyrimidin-4-yl)-azetidine-1-carboxylic acid tert-butyl ester

A 100 mL 3-neck round bottom flask fitted with a magnetic stirrer and flushed with nitrogen was charged with zinc dust (813 mg, preactivated according to the above Preparation 1, 12.7 mmol) and DMA (10 mL, anhydrous). 1,2-dibromoethane (236 mg, 1.27 mmol) was added slowly, followed by TMSCl (137 mg, 1.27 mmol). The reaction was stirred for 15 minutes at RT. A solution of N-Boc-3-iodoazetidine (2.7 g, 9.5 mmol) in DMA (10 mL, anhydrous) was added dropwise. The suspension was stirred for 1 h at RT.

A 100 mL 3-neck round bottom flask fitted with a mechanical stirrer was charged with 5-bromo-2,4-dichloro-pyrimidine (2 g, 4.42 mmol), Pd(dppf)Cl₂ (324 mg, 0.442 mmol), CuI (84 mg, 0.442 mmol), and DMA (20 mL, anhydrous). The dark solution was degassed for 15 minutes. The clear zinc reagent solution above the residual solid zinc was transferred to the above 100 mL flask by cannulation. The dark solution was degassed and heated to 80° C. for 16 h. The reaction was diluted with brine and extracted with EtOAc (3×100 mL). The combined organics were washed with water (2×100 mL) and brine (100 mL), followed by drying over sodium sulfate. The solution was concentrated and the residue was purified by flash column chromatography provides the title compound (0.7 g, 2.0 mmol, yield: 46%). ESI-MS (M+1): 348 calc. for C₁₂H₁₅BrClN₃O₂ 347.

Step 2. 4-azetidin-3-yl-5-bromo-2-chloro-pyrimidine hydrochloride

The mixture of 3-(5-bromo-2-chloro-pyrimidin-4-yl)-azetidine-1-carboxylic acid tert-butyl ester (0.7 g, 2.0 mmol) in HCl/MeOH (10 mL) was stirred at RT for 1 h. Then it was concentrated to give 4-azetidin-3-yl-5-bromo-2-chloro-pyrimidine hydrochloride (0.57 g, 2.0 mmol, yield 100%) which was used in the next step without further purification. ESI-MS (M+1): 248 calc. for C₇H₇BrClN₃ 247.

Step 3. (1H-benzoimidazol-2-yl)-[3-(5-bromo-2-chloro-pyrimidin-4-yl)-azetidin-1-yl]-methanone

To a solution of 4-azetidin-3-yl-5-bromo-2-chloro-pyrimidine hydrochloride (0.57 mg, 2.0 mmol) in DCM (20 mL) were added HATU (1.5 g, 4.0 mmol), TEA (404 mg, 4 mmol) and 1H-benzoimidazole-2-carboxylic acid (398 mg, 2.4 mmol). The reaction mixture was stirred at RT for 12 h. TLC showed that most of starting materials were consumed completely. Then the solution was washed with aqueous HCl (1 mol/L) (50 mL×3), saturated aqueous NaHCO₃ (50 mL×3) and brine, dried over MgSO₄. The solution was evaporated, the residue was purified by column chromatography to give the product (206 mg, 0.53 mmol, yield: 27%). ESI-MS (M+1): 392 calc. for C₁₅H₁₁BrClN₅O 391

Step 4. (1H-benzoimidazol-2-yl)-[3-(2-chloro-5-phenyl-pyrimidin-4-yl)-azetidin-1-yl]-methanone

A solution of (1H-benzoimidazol-2-yl)-[3-(5-bromo-2-chloro-pyrimidin-4-yl)-azetidin-1-yl]-methanone (206 mg, 0.53 mmol) in dioxane (15 mL) was treated with Na₂CO₃ (112 mg, 1.1 mmol dissolved 1 mL of H₂O), followed by additional of phenylboronic acid (78 mg 0.64 mmol) and Pd(dppf)Cl₂ (37 mg, 0.05 mmol). The resulting mixture was heated at refluxing overnight under N₂ atmosphere. TLC showed that most of the staring materials were consumed completely. The solution was filtered, and the filter was concentrated. And the residue was purified by silica gel chromatography to give the product (102 mg, 0.28 mmol, yield: 53%). ESI-MS (M+1): 362 calc. for C₂₁H₁₆ClN₅O 361.

Step 5. (1H-benzoimidazol-2-yl)-[3-(5-phenyl-pyrimidin-4-yl)-azetidin-1-yl]-methanone

To a solution of (1H-Benzoimidazol-2-yl)-[3-(2-chloro-5-phenyl-pyrimidin-4-yl)-azetidin-1-yl]-methanone (102 mg, 0.28 mmol) in MeOH (10 mL) was added Pd/C (100 mg). The reaction solution was stirred at RT overnight under H₂ atmosphere. The mixture was filtered and concentrated to give the product (51 mg, 0.16 mmol, yield: 55%).

¹H NMR: (CDCl₃, 400 MHz): δ (ppm) 9.19 (s, 1H), 8.61 (s, 1H), 7.61-7.57 (m, 2H), 7.49-7.41 (m, 5H), 7.31-7.18 (m, 2H), 5.07 (d, J=6.8 Hz, 2H), 4.59-4.57 (m, 1H), 4.39-4.34 (m, 1H), 4.18-4.14 (m, 1H).

ESI-MS (M+1): 328.

PDE10 IC₅₀ (uM): 0.0291.

Example 16.1 2-(3-(3-(prop-1-yn-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline

A mixture of 2-(3-(3-chloropyrazin-2-yl)azetidin-1-yl)quinoline (0.200 g, 0.674 mmol), tributyl(prop-1-yn-1-yl)stannane (0.266 g, 0.809 mmol), and bis(tri-t-butylphosphine) palladium (o) (0.017 g, 0.034 mmol) in p-dioxane (4 mL) was heated at 100° C. in 16 h. The reaction mixture was cooled, concentrated, and purified by ISCO (0-60% EtOAc/Hexanes) to give the title compound (128 mg, 68%).

¹H NMR (300 MHz, MeOH) 8.56 (1H, d, J=2.5 Hz), 8.44 (1H, d, J=2.5 Hz), 8.04 (1H, d, J=9.1 Hz), 7.71 (2H, dd, J=7.8, 5.6 Hz), 7.58 (1H, td, J=7.7, 1.3 Hz), 7.27 (1H, t, J=7.5 Hz), 6.80 (1H, d, J=8.9 Hz), 4.51-4.66 (5H, m), 2.21 (3H, s).

ESI-MS (M+1): 601. PDE10 IC₅₀ (μM): 0.077.

Example 17.1 2-[3-(3-m-tolyl-pyrazin-2-yl)-azetidin-1-yl]-quinoline

To a solution of 2-azetidin-3-yl-3-m-tolyl-pyrazine hydrochloride (131 mg, 0.05 mmol) and 2-chloro-quinoline (82 mg, 0.05 mmol) in DMF (10 mL) was added Cs₂CO₃ (325 mg, 1.0 mmol). The reaction mixture was stirred at 100° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (30 mL×2). The combined organic extracts were washed with water (30 mL) and brine (30 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel (20% to 40% EtOAc in petroleum ether) to give 2-[3-(3-m-tolyl-pyrazin-2-yl)-azetidin-1-yl]-quinoline (44 mg, 0.13 mmol, 25%).

The following Table 24A lists compounds of Examples 17.1 to 17.6, which were made analogous to Scheme 17 by using the appropriate materials and reaction conditions, which are listed in Table 24B. The NMR data of the Examples are listed in Table 24C.

TABLE 24A EXAMPLES 17.1 TO 17.6 Ex. # Structure Chemical Name ESI-MS (M + 1) IC₅₀ (uM) 17.1

2-[3-(3-m-Tolyl- pyrazin-2-yl)-azetidin-1- yl]-quinoline 353 0.00178 17.2

2-[3-(3-m-Tolyl- pyrazin-2-yl)-azetidin-1- yl]-quinazoline 354 0.012 17.3

2-[3-(3-m-Tolyl- pyrazin-2-yl)-azetidin-1- yl]-quinoxaline 354 0.0209 17.4

2-[3-(3-m-Tolyl- pyrazin-2-yl)-azetidin-1- yl]-benzothiazole 359 0.0319 17.5

2-{3-[3-(3-Methoxy- phenyl)-pyrazin-2-yl]- azetidin-1-yl}-quinoline 369 0.00299 17.6

2-{3-[3-(3-Methoxy- phenyl)-pyrazin-2-yl]- azetidin-1-yl}- quinazoline 370 0.00929

TABLE 24B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 17.1 to 17.6. Ex. # Starting Material 1 Starting Material 2 Reaction Condition 17.1

  31 PREPARATION 9

Cs₂CO₃, DMF, 100° C. 17.2 31 PREPARATION 9

Cs₂CO₃, DMF, 100° C. 17.3 31 PREPARATION 9

Cs₂CO₃, DMF, 100° C. 17.4 31 PREPARATION 9

ALDRICH Cs₂CO₃, DMF, 100° C. 17.5

  34 PREPARATION 10

Cs₂CO₃, DMF, 100° C. 17.6 34 PREPARATION 10

Cs₂CO₃, DMF, 100° C. Unless otherwise stated, all starting materials are commercially available from common vendors.

TABLE 24C 1H NMR δ (PPM) DATA FOR EXAMPLES 17.1 TO 17.6 Ex. # Structure NMR 17.1

(CDCl₃, 400 MHz): 8.53-8.49 (m, 2H); 7.99 (d, J = 8.4 Hz, 1H); 7.92 (d, J = 8.4 Hz, 1H); 7.60 (t, J = 6.4 Hz, 2H); 7.33 (dd, J = 2.4, 7.6 Hz, 2H); 7.24 (d, J = 7.6 Hz, 1H); 7.19 (s, 1H); 7.12 (d, J = 7.6 Hz, 1H); 6.53 (d, J = 9.2 Hz, 1H); 4.89 (br s, 1H); 4.72-4.68 (m, 2H); 4.48-4.42 (m, 2H); 2.37 (s, 3H) 17.2

CD₃OD, 400 MHz): 9.04 (s, 1H); 8.12 (d, J = 1.2 Hz, 1H); 8.49 (d, J = 1.2 Hz, 1H); 7.71-7.67 (m, 2H); 7.54-7.52 (m, 1H); 7.41 (t, J = 7.6 Hz, 1H); 7.33-7.26 (m, 2H); 7.285-7.23 (m, 2H); 4.38-4.36 (m, 5H); 2.43 (s, 3H) 17.3

(CD₃OD, 400 MHz): 8.62 (d, J = 2.4 Hz, 1H); 8.52 (d, J = 2.4 Hz, 1H); 8.17 (s, 1H), 7.79-7.76 (m, 1H); 7.61 (dd, J = 1.6, 8.8 Hz, 1H); 7.57-7.52 (m, 1H); 7.43 (t, J = 7.6 Hz, 1H); 7.37-7.33 (m, 3H); 7.29 (d, J = 7.6 Hz, 1H); 4.44-4.39 (m, 5H); 2.45 (s, 3H). 17.4

(CD₃OD, 400 MHz): 8.63 (d, J = 1.2 Hz, 1H); 8.51 (d, J = 1.6 Hz, 1H); 7.60 (d, J = 8.0 Hz, 1H); 7.44- 7.39 (m, 2H); 7.34-7.30 (m, 2H); 7.27-7.22 (m, 2H); 7.06-7.02 (m, 1H); 4.44-4.40 (m, 1H); 4.35- 4.25 (m, 4H); 2.43 (s, 3H). 17.5

(CD₃OD, 400 MHz): 8.54 (s, 1H); 8.50 (d, J = 0.8 Hz, 1H); 7.83 (d, J = 8.8 Hz, 1H); 7.71 (d, J = 8.4 Hz, 1H); 7.57 (d, J = 8.0 Hz, 1H); 7.50 (t, J = 7.2 Hz, 1H); 7.40 (t, J = 8.0 Hz, 1H); 7.18 (t, J = 7.2 Hz, 1H); 7.05-7.00 (m, 3H); 6.60 (d, J = 8.8 Hz, 1H); 4.47-4.38 (m, 5H); 3.86 (s, 3H). 17.6

(CDCl3, 400 MHz): 8.96 (s, 1H); 8.53 (d, J = 2.8 Hz, 1H); 8.46 (d, J = 2.4 Hz, 1H); 7.62-7.55 (m, 3H); 7.38-7.33 (m, 1H) 7.16-7.13 (m, 1H); 7.01- 6.95 (m, 3H); 4.51-4.41 (m, 4H); 4.35-4.29 (m, 1H); 3.80 (s, 3H).

Example 18.1 2-{3-[3-(3-methoxy-phenyl)-pyridin-2-yl]-azetidin-1-yl}-quinoline

To a solution of 2-[3-(3-bromo-pyridin-2-yl)-azetidin-1-yl]-quinoline (339 mg, 1 mmol), 3-methoxy-phenylboronic acid (167.2 mg, 1.1 mmol), K₃PO₄ (414 mg, 2.0 mmol) in dioxane (20 mL) and water (2 mL) was added Pd(dppf)Cl₂ (36.6 mg, 0.05 mmol) then the reaction mixture was stirred at 90° C. under nitrogen atmosphere overnight. The reaction mixture was filtered through CELITE® and washed with EtOAc (50 mL). The filtrate was concentrated and the crude product was purified by ISCO silica gel column (10% to 80% EtOAc in petroleum ether) to give 2-{3-[3-(3-methoxy-phenyl)-pyridin-2-yl]-azetidin-1-yl}-quinoline (132 mg, 0.36 mmol, yield 36%).

The following Table 25A lists compounds of Examples 18.1 to 18.2, which were made analogous to Scheme 18 by using the appropriate materials and reaction conditions, which are listed in Table 25B. The NMR data of the Examples are listed in Table 25C.

TABLE 25A EXAMPLES 18.1 TO 18.2 ESI- MS Ex. # Structure Chemical Name (M + 1) IC₅₀ (uM) 18.1

2-{3-[3-(3-Methoxy- phenyl)-pyridin-2-yl]- azetidin-1-yl}-quinoline 368 0.00493 18.2

2-[3-(3-m-Tolyl-pyridin-2- yl)-azetidin-1-yl]-quinoline 352 0.00609

TABLE 25B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 18.1 TO 18.2. Ex. # Starting Material 1 Starting Material 2 Reaction Condition 18.1

  PREPARATION 1

Pd(dppf)Cl₂, K₃PO₄, Dioxane/water 18.2

  PREPARATION 1

Pd(dppf)Cl₂, K₂PO₄, Dioxane/water Unless otherwise stated, all starting materials are commercially available from common vendors.

TABLE 25C 1H NMR δ (PPM) DATA FOR EXAMPLES 18.1 TO 18.2 Ex. # Structure NMR 18.1

(CDCl₃, 400 MHz): 8.79 (s, 1H); 8.03 (d, J = 9.2 Hz, 1H); 7.93 (d, J = 8.0 Hz, 1H); 7.78 (d, J = 8.8 Hz, 1H); 7.66-7.62 (m, 2H); 7.59-7.56 (m, 1H); 7.40-7.35 (m, 2H); 6.99-6.97 (m, 1H); 6.75 (t, J = 8.4 Hz, 2H); 6.57 (d, J = 9.2 Hz, 1H); 4.75 (s, 3H); 4.54-4.52 (m, 2H); 3.79 (s, 3H). 18.2

(CDCl₃, 400 MHz): 8.65 (s, 1H); 7.99 (d, J = 9.2 Hz, 1H); 7.88 (d, J = 8.4 Hz, 1H); 7.67-7.59 (m, 3H); 7.35-7.30 (m, 3H); 7.22-7.19 (m, 1H); 6.95 (d, J = 11.6 Hz, 2H); 6.54 (d, J = 5.2 Hz, 1H); 4.74 (s, 3H); 4.33 (s, 2H); 2.37 (s, 3H).

Example 19.1 (R & S)-2-{3-[3-(3-methyl-pyrrolidin-1-yl)-pyridin-2-yl]-azetidin-1-yl}-quinoline

To a solution of 2-[3-(3-bromo-pyridin-2-yl)-azetidin-1-yl]-quinoline (339 mg, 1 mmol), 3-methyl-pyrrolidine (93.5 mg, 1.1 mmol), BINAP (31.1 mg, 0.05 mmol), t-BuONa (196 mg, 2 mmol) in dioxane (25 mL) was added Pd₂(dba)₃ (45.75 mg, 0.05 mmol) then the reaction mixture was stirred at 90° C. under nitrogen atmosphere overnight. The reaction mixture was filtered through CELITE® and washed with EtOAc (50 mL). The filtrate was concentrated and the crude product was purified by ISCO silica gel column (10% to 80% EtOAc in petroleum ether) to give 2-{3-[3-(3-methyl-pyrrolidin-1-yl)-pyridin-2-yl]-azetidin-1-yl}-quinoline (64 mg, 0.19 mmol, yield 19%).

The following Table 26A lists compounds of Examples 19.1 to 19.2, which were made analogous to Scheme 19 by using the appropriate materials and reaction conditions, which are listed in Table 26B. The NMR data of the Examples are listed in Table 26C.

TABLE 26A EXAMPLES 19.1 TO 19.2 ESI-MS Ex. # Structure Chemical Name (M + 1) IC₅₀ (uM) 19.1

(R & S)-2-{3-[3-(3-Methyl- pyrrolidin-1-yl)-pyridin-2-yl]- azetidin-1-yl}-quinoline 345 0.864  19.2

4-Methyl-2′-(1-quinolin-2-yl- azetidin-3-yl)-3,4,5,6- tetrahydro-2H- [1,3′]bipyridinyl 345 0.00522

TABLE 26B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 19.1 TO 19.2. Ex. # Starting Material 1 Starting Material 2 Reaction Condition 19.1

  PREPARATION 1

Pd₂(dba)₃, BINAP, t- BuONa, dioxane 19.2

  PREPARATION 1

Pd₂(dba)₃, BINAP, t- BuONa, dioxane Unless otherwise stated, all starting materials are commercially available from common vendors.

TABLE 26C 1H NMR δ (PPM) DATA FOR EXAMPLES 19.1 TO 19.2 Ex. # Structure NMR 19.1

(CDCl₃, 400 MHz): 8.22 (s, 1H); 8.02 (d, J = 9.2 Hz, 1H); 7.96 (d, J = 8.4, 1H); 7.67-7.62 (m, 2H); 7.40-7.31 (m, 3H); 6.62 (d, J = 9.2 Hz, 1H); 5.04-4.74 (m, 3H); 4.60-4.57 (m, 1H); 3.42 (s, 1H); 3.41-3.32 (m, 1H); 3.27-3.18 (m, 1H); 2.91-2.86 (m, 1H); 2.39-2.33 (m, 1H); 2.14-2.09 (m, 1H); 1.62-1.57 (m, 1H); 1.19 (s, 1H); 1.09 (d, J = 2.4 Hz, 3H). 19.2

(CDCl₃, 400 MHz): 8.32-8.31 (m, 1H); 7.85 (d, J = 8.8 Hz, 1H); 7.73 (d, J = 8.4 Hz, 1H), 7.60-7.58 (m, 1H); 7.53-7.51 (m, 1H); 7.34-7.32 (m, 1H); 7.26-7.21 (m, 1H); 7.19-7.10 (m, 1H); 6.66 (d, J = 8.8 Hz, 1H); 4.59- 4.52 (m, 3H); 4.51-4.47 (m, 2H); 2.81 (m, 4H); 1.79- 1.68 (m, 4H); 1.62-1.56 (m, 2H).

Example 20.1 {1-[3-(1-quinolin-2-yl-piperidin-4-yl)-pyrazin-2-yl]-piperidin-4-yl}-methanol

To a solution of [1-(3-piperidin-4-yl-pyrazin-2-yl)-piperidin-4-yl]-methanol hydrochloride (156 mg, 0.5 mmol) and 2-chloro-quinoline (81.5 mg 0.5 mmol) in DMF (5 mL) was added Cs₂CO₃ (325 mg, 1 mmol). The reaction mixture was stirred at 100° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (2×20 mL). The combined organic extracts were washed with water (15 mL) and brine (15 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel to give {1-[3-(1-quinolin-2-yl-piperidin-4-yl)-pyrazin-2-yl]-piperidin-4-yl}-methanol (142 mg, 0.35 mmol, yield 70.47%).

The following Table 27A lists compounds of Examples 20.1 to 20.10, which were made analogous to Scheme 20 by using the appropriate materials and reaction conditions, which are listed in Table 27B. The NMR data of the Examples are listed in Table 27C.

TABLE 27A EXAMPLES 20.1 TO 20.10 ESI-MS Ex. # Structure Chemical Name (M + 1) IC₅₀ (uM) 20.1 

{1-[3-(1-Quinolin-2-yl- piperidin-4-yl)-pyrazin- 2-yl]-piperidin-4-yl}- methanol 404 0.00172 20.2 

{1-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyrazin-2- yl]-piperidin-4-yl}- methanol 376 0.00114 20.3 

{1-[3-(1-Quinazolin-2- yl-azetidin-3-yl)- pyrazin-2-yl]-piperidin- 4-yl}-methanol 377 0.00256 20.4 

4-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyrazin-2- yl]-phenylamine 377 >10      20.5 

{1-[3-(1-Benzothiazol- 2-yl-azetidin-3-yl)- pyrazin-2-yl]-piperidin- 4-yl}-meethanol 382 0.0323  20.6 

{1-[3-(1-Benzooxazol- 2-yl-azetidin-3-yl)- pyrazin-2-yl]-piperidin- 4-yl}-methanol 366 2.170  20.7 

(1-{3-[1-(5-Methyl- pyridin-2-yl)-azetidin-3- yl]-pyrazin-2-yl}- piperidin-4-yl)-methanol 340 0.583  20.8 

2-(4-benzylpiperidin-1- yl)-3-(1-(quinolin-2- yl)azetidin-3- yl)quinoxaline 426 0.00243 20.9 

[5′-Fluoro-2′-(1- quinolin-2-yl-azetidin-3- yl)-3,4,5,6-tetrahydro- 2H-[1,3′]bipyridinyl-4- yl]-methanol 393 0.181  20.10

{1-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyridazin- 4-yl]-piperidin-4-yl}- methanol 376 0.0322 

TABLE 27B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 20.1 TO 20.10. Ex. # Starting Material 1 Starting Material 2 Reaction Condition 20.1 

  PREPARATION 12

Cs₂CO₃, DMF; 100° C. 20.2 

  PREPARATION 11

Cs₂CO₃, DMF; 100° C. 20.3 

  PREPARATION 11

Cs₂CO₃, DMF; 100° C. 20.4 

  PREPARATION 11

Cs₂CO₃, DMF; 100° C. 20.5 

  PREPARATION 11

  ALDRICH Cs₂CO₃, DMF; 100° C. 20.6 

  PREPARATION 11

Cs₂CO₃, DMF; 100° C. 20.7 

  PREPARATION 11

  ALDRICH Cs₂CO₃, DMF; 100° C. 20.8 

  PREPARATION 15

Cs₂CO₃, DMF; 100° C. 20.9 

  PREPARATION 23

Cs₂CO₃, DMF; 100° C. 20.10

  PREPARATION 18

Cs₂CO₃, DMF; 100° C. Unless otherwise stated, all starting materials are commercially available from common vendors.

TABLE 27C 1H NMR δ (PPM) DATA FOR EXAMPLES 20.1 TO 20.10 Ex. # Structure Name 20.1 

(CDCl₃, 400 MHz): 8.28-8.15 (m, 4H); 7.80-7.69 (m, 2H); 7.52-7.44 (m, 1H); 7.14 (d, J = 8.0 Hz, 1H); 4.62 (s, 2H); 4.30 (d, J = 6.4 Hz, 1H); 3.64 (d, J = 29.4 Hz, 3H); 3.44 (d, J = 7.6 Hz, 3H); 2.97-2.91 (m, 2H); 2.10 (s, 4H); 1.90 (d, J = 6.4 Hz, 2H); 1.74 (s, 1H); 1.55 (d, J = 9.6 Hz, 2H). 20.2 

(CDCl₃, 400 MHz): 8.15 (d, J = 2.4 Hz, 1H); 8.07 (d, J = 2.0 Hz, 1H); 7.87 (d, J = 8.4 Hz, 1H); 7.74 (d, J = 8.4 Hz, 1H); 7.60 (d, J = 7.6 Hz, 1H); 7.53 (t, J = 7.2 Hz, 1H); 7.23-7.19 (m, 1H); 6.65 (d, J = 8.8 Hz, 1H); 4.55 (t, J = 8.0 Hz, 2H); 4.46 (t, J = 6.4 Hz, 2H); 4.34- 4.28 (m, 1H); 3.58 (d, J = 6.0 Hz, 2H); 3.44 (d, J = 12.8 Hz, 2H); 2.89-2.92 (m, 2H); 2.06 (s, 1H); 1.87 (d, J = 12.0 Hz, 1H); 1.74-1.68 (m, 1H); 1.52-1.41 (m, 2H). 20.3 

(CD₃OD, 400 MHz): 9.01 (s, 1H); 8.06 (d, J = 2.8 Hz, 1H); 8.01 (d, J = 2.4 Hz, 1H); 7.71 (dd, J = 2.4, 8.0 Hz, 1H); 7.67-7.63 (m, 1H); 7.49 (d, J = 8.4 Hz, 1H); 7.22-7.18 (m, 1H); 4.52 (t, J = 8.0 Hz, 2H); 4.36- 4.30 (m, 2H); 4.28-4.26 (m, 1H); 3.40 (d, J = 6.4 Hz, 4H); 3.37 (s, 1H); 2.81-2.74 (m, 2H); 1.81-1.78 (m, 2H); 1.61-1.54 (m, 1H); 1.43-1.39 (m, 2H). 20.4 

(CD₃OD, 400 MHz): 8.91 (dd, J = 2.4, 7.2 Hz, 1H); 8.64 (dd, J = 0.8, 2.4 Hz, 1H); 8.31 (s, 1H); 7.82 (d, J = 8.4 Hz, 1H); 7.67 (m, 1H); 7.66-7.59 (m, 1H); 7.44- 7.40 (m, 1H); 4.73-4.72 (m, 1H); 4.31-4.25 (m, 4H); 4.17-4.16 (m, 1H); 4.08-4.05 (m, 1H); 3.83-3.75 (m, 3H); 3.52 (d, J = 6.4 Hz, 2H); 2.11-1.96 (m, 4H). 20.5 

(CD₃OD, 400 MHz): 8.22-8.20 (m, 1H); 8.17-8.15 (dd, J = 2.4, 8.4 Hz, 1H); 7.87 (d, J = 8.0 Hz, 1H); 7.62-7.58 (m, 2H); 7.49-7.44 (m, 1H); 4.62 (m, 1H); 4.54 (m, 1H); 4.32 (d, J = 6.8 Hz, 1H); 4.05-4.01 (m, 2H); 3.94-3.89 (m, 1H); 3.54-3.51 (m, 1H); 3.47 (d, J = 10.4 Hz, 2H); 3.02-2.90 (m, 2H); 1.93-1.86 (m, 2H); 1.58-1.45 (m, 3H). 20.6 

(CD₃OD, 400 MHz): 8.91 (d, J = 2.8 Hz, 1H); 8.66 (dd, J = 1.2, 2.8 Hz, 1H); 7.33-7.30 (m, 2H); 7.20 (m, 1H); 7.10 (dd, J = 1.2, 4.0 Hz, 1H); 4.25-4.10 (m, 5H); 3.96-3.91 (m, 1H); 3.83-3.74 (m, 3H); 3.65 (d, J = 1.6 Hz, 2H); 2.14-1.89 (m, 5H). 20.7 

(CD₃OD, 400 MHz): 8.12 (d, J = 2.4 Hz, 1H); 8.07 (d, J = 2.4 Hz, 1H); 7.83 (s, 1H); 7.43-7.40 (m, 1H); 6.42 (d, J = 8.8 Hz, 1H); 4.39-4.34 (m, 3H); 4.18-4.15 (m, 2H); 3.48-3.43 (m, 4H); 2.87-2.80 (m, 2H); 2.18 (s, 3H); 1.88-1.84 (m, 2H); 1.68-1.62 (m, 1H); 1.49-1.42 (m, 2H). 20.8 

(CD₃OD, 400 MHz): 8.34 (d, J = 8.0 Hz, 1H); 7.89 (s, 1H); 7.88 (t, J = 1.2 Hz, 1H); 7.86 (t, J = 1.2 Hz, 1H); 7.81-7.78 (m, 2H); 7.70-7.66 (m, 1H); 7.61-7.57 (m, 1H); 7.54-7.50 (m, 1H); 7.03 (d, J = 9.2 Hz, 1H); 4.97-4.90 (m, 6H); 3.67 (d, J = 12.4 Hz, 2H); 3.54 (d, J = 6.0 Hz, 2H); 3.05-2.99 (m, 2H); 1.98-1.94 (m, 2H); 1.76-1.73 (m, 2H). 20.9 

(CD₃OD, 400 MHz): 8.19-8.16 (m, 2H); 7.82 (d, J = 7.6 Hz, 1H); 7.77-7.71 (m, 2H); 7.45 (t, J = 7.6 Hz, 1H); 7.37 (d, J = 10.4 Hz, 1H); 7.04 (d, J = 9.2 Hz, 1H); 6.04 (s, 1H); 5.74 (s, 1H); 4.72 (s, 2H); 3.47-3.43 (m, 4H); 2.67 (t, J = 10.8 Hz, 2H); 1.83-1.80 (m, 2H); 1.60-1.57 (m, 1H); 1.43-1.31 (m, 3H). 20.10

(CDCl₃, 400 MHz): 8.77 (s, 1H); 7.82 (d, J = 8.8 Hz, 1H); 7.66 (s, 1H); 7.54 (d, J = 7.6 Hz, 1H); 7.46 (t, J = 7.6 Hz, 1H); 7.15 (t, J = 8.0 Hz, 1H); 6.81 (t, J = 2.0 Hz, 1H); 6.61 (d, J = 8.8 Hz, 1H); 4.60-4.58 (m, 4H); 4.41-4.16 (m, 1H); 3.55 (s, 2H); 3.23 (d, J = 12.4 Hz, 2H); 2.70-2.68 (m, 2H); 1.86 (d, J = 12.0 Hz, 2H); 1.64 (s, 2H); 1.51-1.37 (m, 1H)

Examples 21.2, 21.2 and 21.3 Racemic Mixture and Separated Enantiomers, wherein the Absolute Stereospecificity were not Determined

Step 1. (R & S)-2-{3-[3-(3-methyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-quinoline

To a solution of 2-Azetidin-3-yl-3-(3-methyl-pyrrolidin-1-yl)-pyrazine hydrochloride (44) (127 mg, 0.5 mmol, PREPARATION 13) and 2-chloro-quinoline (81.5 mg 0.5 mmol) in DMF (5 mL) was added Cs₂CO₃ (325 mg, 1 mmol). The reaction mixture was stirred at 100° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (2×20 mL). The combined organic extracts were washed with water (15 mL) and brine (15 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel to give (rac)-2-{3-[3-(3-methyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-quinoline (127.65 mg, 0.37 mmol, yield 74%).

ESI-MS (M+1): 346. PDE10 IC₅₀ (uM): 0.00465.

(CDCl₃, 400 MHz): 8.05 (d, J=8.4 Hz, 1H); 8.00 (d, J=9.2 Hz, 1H); 7.93 (d, J=2.4 Hz, 1H); 7.84 (d, J=2.4 Hz, 1H); 7.66-7.60 (m, 2H); 7.35 (t, J=7.6 Hz, 1H); 6.58 (d, J=9.6 Hz, 1H); 4.94-4.51 (m, 4H); 4.48-4.34 (m, 1H); 3.45 (s, 3H); 3.08 (s, 1H); 2.31-2.25 (m, 1H); 2.09-2.02 (m, 1H); 1.58-1.51 (m, 1H); 1.07 (d, J=6.8 Hz, 3H).

Step 2. (R or S)-2-{3-[3-(3-methyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-quinoline

The racemic 2-{3-[3-(3-methyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-quinoline obtained above (450 mg, 1.3 mmol) was separated by chiral prep. HPLC (Column: Chiralcel OD-H 250*30 mm, 5u; Mobile phase: 85% hexane in EtOH (0.05% diethyl amine); Flow rate: 30 mL/minute) to give their separated stereoisomers (187 mg, 0.54 mmol, 42% yield) and (175 mg, 0.50 mmol, 38.5% yield). The absolute stereospecificity was not determined.

Separated Isomer Example 21.2

ESI-MS (M+1): 346. PDE10 IC₅₀ (uM): 0.00367.

(CDCl₃, 400 MHz): 7.97-7.93 (m, 2H); 7.87 (d, J=8.8 Hz, 1H); 7.73 (d, J=8.4 Hz, 1H); 7.60 (d, J=8.0 Hz, 1H); 7.53 (t, J=8.4 Hz, 1H); 7.22 (t, J=7.6 Hz, 1H); 6.66 (d, J=9.2 Hz, 1H); 4.59-4.53 (m, 3H); 4.43 (t, J=8.0 Hz, 1H); 4.33-4.26 (m, 1H); 3.66-3.48 (m, 3H); 3.18 (t, J=8.8 Hz, 1H); 2.37-2.30 (m, 1H); 2.13-2.09 (m, 1H); 1.65-1.55 (m, 1H); 1.22 (d, J=6.8 Hz, 3H).

Separated Isomer Example 21.3

ESI-MS (M+1): 346. PDE10 IC₅₀ (uM): 0.00367.

(CDCl₃, 400 MHz): 7.86-7.83 (m, 2H); 7.76 (d, J=8.8 Hz, 1H); 7.64 (d, J=8.4 Hz, 1H); 7.50 (d, J=7.6 Hz, 1H); 7.45-7.42 (m, 1H); 7.12 (t, J=8.4 Hz, 1H); 6.55 (d, J=8.8 Hz, 1H); 4.48-4.43 (m, 3H); 4.18 (t, J=8.4 Hz, 1H); 4.20-4.17 (m, 1H); 3.55-3.38 (m, 3H); 3.10-3.06 (m, 1H); 2.25-2.24 (m, 1H); 2.03-1.99 (m, 1H); 1.52-1.47 (m, 1H); 1.05-1.04 (d, J=6.8 Hz, 3H).

Example 22.1 2-(1-quinolin-2-yl-azetidin-3-yl)-3-m-tolyl-quinoxaline

To a solution of 2-azetidin-3-yl-3-m-tolyl-quinoxaline hydrochloride (311 mg, 1 mmol) and 2-chloro-quinoline (163 mg, 1.0 mmol) in DMF (6 mL) was added Cs₂CO₃ (650 mg, 2 mmol). The reaction mixture was stirred at 100° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (2×30 mL). The combined organic extracts were washed with water (20 mL) and brine (20 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel to give 2-(1-quinolin-2-yl-azetidin-3-yl)-3-m-tolyl-quinoxaline (256 mg, 0.64 mmol yield 63.7%).

The following Table 28A lists compounds of Examples 22.1 to 22.4, which were made analogous to Scheme 22 by using the appropriate materials and reaction conditions, which are listed in Table 28B. The NMR data of the Examples are listed in Table 28C.

TABLE 28A EXAMPLES 22.1 TO 22.4 ESI-MS Ex. # Structure Chemical Name (M + 1) IC₅₀ (uM) 22.1

2-(1-Quinolin-2-yl-azetidin- 3-yl)-3-m-tolyl-quinoxaline 403 0.00399 22.2

4-[3-(1-Quinolin-2-yl- azetidin-3-yl)-quinoxalin-2- yl]-phenylamine 404 0.00156 22.3

3-[3-(1-Quinolin-2-yl- azetidin-3-yl)-quinoxalin-2- yl]-phenol 405 0.00099 22.4

2-(3-Methoxy-phenyl)-3-(1- quinolin-2-yl-azetidin-3-yl)- quinoxaline 419 0.00222

TABLE 28B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 22.1 TO 22.4 Ex. # Starting Material 1 Starting Material 2 Reaction Condition 22.1

  PREPARATION 20

Cs₂CO₃, DMF, 100° C. 22.2

  PREPARATION 20

Cs₂CO₃, DMF, 100° C. 22.3

  PREPARATION 20

Cs₂CO₃, DMF, 100° C. 22.4

  PREPARATION 20

Cs₂CO₃, DMF, 100° C. Unless otherwise stated, all starting materials are commercially available from common vendors.

TABLE 28C 1H NMR δ (PPM) DATA FOR EXAMPLES 22.1 TO 22.4 Ex. # Structure NMR 22.1

(DMSO, 400 MHz): 8.15-8.08 (m, 2H); 8.01 (d, J = 8.0 Hz, 1H); 7.84-7.82 (m, 2H); 7.68 (d, J = 7.6 Hz, 1H); 7.53-7.47 (m, 4H); 7.39- 7.31 (m, 2H); 7.21-7.17 (m, 1H); 6.75 (d, J = 8.8 Hz, 1H); 4.58-4.54 (m, 1H); 4.39 (t, J = 8.0 Hz, 2H); 4.26 (t, J = 8.4 Hz, 2H); 2.38 (s, 3H). 22.2

(CD₃OD, 400 MHz): 8.89 (d, J = 8.8 Hz, 1H); 8.11-8.08 (m, 2H); 7.86-7.82 (m, 3H); 7.75- 7.72 (m, 4H); 7.49-7.42 (m, 3H); 6.92 (d, J = 9.2 Hz, 1H); 4.85-4.68 (m, 5H). 22.3

(CD₃OD, 400 MHz): 8.29 (d, J = 9.2 Hz, 1H); 8.15-8.09 (m, 2H); 7.87-7.83 (m, 3H); 7.78- 7.73 (m, 2H); 7.50-7.40 (m, 2H); 7.10-6.99 (m, 3H); 6.94 (d, J = 9.2 Hz, 1H); 4.81-4.67 (m, 5H). 22.4

(CD₃OD, 400 MHz): 8.27 (d, J = 8.0 Hz, 1H); 8.25-8.28 (m, 2H); 7.86-7.82 (m, 3H); 7.77- 7.71 (m, 2H); 7.53-7.46 (m, 2H); 7.21-7.13 (m, 3H); 6.93 (d, J = 9.2 Hz, 1H); 4.81-4.66 (m, 5H); 3.88 (s, 3H).

Example 23.1 2-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-phenol

To a solution of 2-(3-azetidin-3-yl-pyrazin-2-yl)-phenol hydrochloride (275 mg, 1 mmol) and 2-chloro-quinoline (163 mg, 1 mmol) in DMF (10 mL) was added Cs₂CO₃ (650 mg, 2 mmol). The reaction mixture was stirred at 100° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (30 mL×2). The combined organic extracts were washed with water (30 mL) and brine (30 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by ISCO silica gel column (10% to 80% EtOAc in petroleum ether) to give 2-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-phenol (56 mg, 0.16 mmol, yield 16%).

The following Table 29A lists compounds of Examples 23.1 to 23.8, which were made analogous to Scheme 23 by using the appropriate materials and reaction conditions, which are listed in Table 29B. The NMR data of the Examples are listed in Table 29C.

TABLE 29A EXAMPLES 23.1 TO 23.8 ESI-MS IC₅₀ Ex. # Structure Chemical Name (M + 1) (uM) 23.1

2-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyrazin-2- yl]-phenol 355 0.0339  23.2

3-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyrazin-2- yl]-phenol 355 0.00465 23.3

4-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyrazin-2- yl]-phenol 355 0.00442 23.4

2-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyrazin-2- yl]-phenylamine 354 0.133  23.5

3-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyrazin-2- yl]-phenylamine 354 0.0111  23.6

4-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyrazin-2- yl]-phenylamine 354 0.00522 23.7

2-{3-[3-(4-Fluoro-3- methoxy-phenyl)-pyrazin- 2-yl]-azetidin-1-yl}- quinoline 387 0.00298 23.8

2-Fluoro-4-[3-(1-quinolin- 2-yl-azetidin-3-yl)- pyrazin-2-yl]-phenylamine 372 0.00437

TABLE 29B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 23.1 TO 23.8. Unless otherwise stated, all starting materials are commercially available from common vendors Reaction Ex. # Starting Material 1 Starting Material 2 Condition 23.1

Cs₂CO₃, DMF, 100° C. 23.2

Cs₂CO₃, DMF, 100° C. 23.3

Cs₂CO₃, DMF, 100° C. 23.4

Cs₂CO₃, DMF, 100° C. 23.5

Cs₂CO₃, DMF, 100° C. 23.6

Cs₂CO₃, DMF, 100° C. 23.7

Cs₂CO₃, DMF, 100° C. 23.8

Cs₂CO₃, DMF, 100° C.

TABLE 29C 1H NMR δ (PPM) DATA FOR EXAMPLES 23.1 TO 23.8 Ex. # Structure NMR 23.1

(CDCl₃, 400 MHz): 8.57 (s, 2H); 8.06 (d, J = 9.6 Hz, 1H); 7.94 (d, J = 8.4 Hz, 1H); 7.73-7.68 (m, 2H); 7.45-7.41 (m, 1H); 7.35-7.31 (m, 1H); 7.29-7.28 (m, 1H); 7.06 (d, J = 8.4 Hz, 1H); 7.02-6.98 (m, 1H); 6.62 (d, J = 9.6 Hz, 1H); 5.07 (s, 1H); 4.88-4.72 (m, 3H); 4.55 (s, 1H); 4.33 (s, 1H) 23.2

(CD₃OD, 400 MHz): 8.68 (m, 1H); 8.52 (m, 1H); 8.49 (m, 1H); 8.28 (d, J = 7.2 Hz, 1H); 7.79-7.71 (m, 2H); 7.51-7.47 (m, 1H); 7.39-7.35 (m, 1H); 6.99-6.91 (m, 4H); 4.86-4.61 (m, 5H) 23.3

(CDCl₃, 400 MHz): 8.56-8.52 (m, 2H); 7.82 (d, J = 8.8 Hz, 1H); 7.95 (d, J = 8.4 Hz, 1H); 7.73- 7.67 (m, 2H); 7.42(t, J = 8.0 Hz, 1H); 7.19 (d, J = 8.0 Hz, 2H); 6.88 (d, J = 8.8 Hz, 2H); 6.62 (d, J = 9.2 Hz, 1H); 4.73 (m, 2H); 4.36 (m, 1H); 4.19 (s, 2H). 23.4

(CDCl₃, 400 MHz): 8.49 (s, 1H); 8.41 (s, 1H); 7.65 (d, J = 8.8 Hz, 1H); 7.51 (d, J = 8.0 Hz, 1H); 7.46 (d, J = 1.2 Hz, 1H); 7.45-7.42 (m, 1H); 7.12-7.10 (m, 2H); 6.94 (dd, J = 7.6 Hz, 1H); 6.81-6.75 (m, 2H); 6.52 (d, J = 8.8 Hz, 1H); 4.37-4.21 (m, 5H); 4.13 (s, 2H) 23.5

(CDCl₃, 400 MHz): 8.61-8.52 (m, 2H); 8.05 (d, J = 9.6 Hz, 1H); 8.00 (d, J = 8.4 Hz, 1H); 7.69- 7.69 (m, 2H); 7.41-7.26 (m, 2H); 7.02-6.98 (m, 2H); 6.91-6.90 (m, 1H); 6.62 (d, J = 9.2 Hz, 1H); 4.85-4.31 (m, 5H). 23.6

(CD₃OD, 400 MHz): 8.63 (d, J = 2.4 Hz, 1H); 8.56 (d, J = 2.4 Hz, 1H); 8.31 (d, J = 9.2 Hz, 1H); 7.89 (d, J = 8.4 Hz, 1H); 7.78-7.75(m, 2H); 7.50 (m, 1H); 7.45 (d, J = 8.4 Hz, 2H); 7.06 (d, J = 8.4 Hz, 2H); 6.94 (d, J = 9.6 Hz, 1H); 4.70 (s, 5H). 23.7

(CDCl3, 400 MHz): 8.63 (d, J = 2.4 Hz, 1H); 8.57 (d, J = 2.0 Hz, 1H); 7.90 (d, J = 8.0 Hz, 1H); 7.76 (d, J = 9.2 Hz, 1H); 7.64 (dd, J = 1.2, 8.0 Hz, 1H); 7.59-7.55 (m, 1H); 7.28-7.20 (m, 3H); 7.06-7.03 (m, 1H); 6.67 (d, J = 8.8 Hz, 1H); 4.49-4.45 (m, 5H); 4.01 (s, 3H) 23.8

(CDCl3, 400 MHz): 8.43 (d, J = 2.0 Hz, 1H); 8.41 (d, J = 2.0 Hz, 1H); 7.80 (d, J = 8.8 Hz, 1H); 7.66 (d, J = 8.4 Hz, 1H); 7.53 (dd, J = 1.2, 8.0 Hz, 1H); 7.48-7.44 (m, 1H); 7.17-7.13 (m, 2H); 7.06-7.03 (m, 1H); 6.81 (t, J = 8.8 Hz, 1H); 6.55 (d, J = 8.8 Hz, 1H); 4.38-4.35 (m, 5H); 4.01 (s, 2H)

Example 24.1 2-[3-(3-piperidin-1-yl-pyrazin-2-yl)-azetidin-1-yl]-quinoline

To a solution of 2-azetidin-3-yl-3-piperidin-1-yl-pyrazine hydrochloride (127 mg, 0.5 mmol) and 2-chloro-quinoline (81.5 mg 0.5 mmol) in DMF (5 mL) was added Cs₂CO₃ (325 mg, 1 mmol). The reaction mixture was stirred at 100° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (2×20 mL). The combined organic extracts were washed with water (15 mL) and brine (15 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by ISCO silica gel column (10% to 80% EtOAc in petroleum ether) to give 2-[3-(3-piperidin-1-yl-pyrazin-2-yl)-azetidin-1-yl]-quinoline (58 mg, 0.17 mmol yield 17%).

The following Table 30A lists compounds of Examples 24.1 to 24.7, which were made analogous to Scheme 24 by using the appropriate materials and reaction conditions, which are listed in Table 30B. The NMR data of the Examples are listed in Table 30C.

TABLE 30A EXAMPLES 24.1 TO 24.7 ESI-MS Ex. # Structure Chemical Name (M + 1) IC₅₀ (uM) 24.1

2-[3-(3-Piperidin-1-yl- pyrazin-2-yl)-azetidin-1- yl]-quinoline 346 0.00393 24.2

2-{3-[3-(4-Methyl- piperidin-1-yl)-pyrazin-2- yl]-azetidin-1-yl}-quinoline 368 0.000803 24.3

1-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyrazin-2- yl]-piperidine-4-carboxylic acid amide 389 0.00048 24.4

1-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyrazin-2- yl]-piperidine-4-carboxylic acid dimethylamide 417 0.00355 24.5

1-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyrazin-2 yl]-piperidine-4-carboxylic acid methylamide 403 0.00251 24.6

1-[3′-(1-Quinolin-2-yl- azetidin-3-yl)-2,3,5,6- tetrahydro- [1,2′]bipyrazinyl-4-yl]- ethanone 389 0.029 24.7

1-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyrazin-2- yl]-piperidin-4-ol 362 0.00497

TABLE 30B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 24.1 TO 24.7. Unless otherwise stated, all starting materials are commercially available from common vendors. Reaction Ex. # Starting Material 1 Starting Material 2 Condition 24.1

Cs₂CO₃, DMF, 100° C. 24.2

Cs₂CO₃, DMF, 100° C. 24.3

Cs₂CO₃, DMF, 100° C. 24.4

Cs₂CO₃, DMF, 100° C. 24.5

Cs₂CO₃, DMF, 100° C. 24.6

Cs₂CO₃, DMF, 100° C. 24.7

Cs₂CO₃, DMF, 100° C.

TABLE 30C 1H NMR δ (PPM) DATA FOR EXAMPLES 24.1 TO 24.7 Ex. # Structure NMR 24.1

(CDCl₃, 400 MHz): 8.12 (s, 2H); 8.05 (d, J = 20.8 Hz, 1H); 7.96 (d, J = 8.4 Hz, 1H); 7.67-7.63 (m, 2H); 7.40- 7.36 (m, 1H); 6.62 (d, J = 9.2 Hz, 1H); 5.07 (s, 1H); 4.75-4.71 (m, 3H); 4.39-4.36 (m, 1H); 3.06-3.04 (m. 4H); 1.75-1.69 (m, 4H); 1.64-1.62 (m, 2H). 24.2

(CDCl₃, 400 MHz): 8.12 (d, J = 2.4 Hz, 1H); 8.06 (d, J = 2.4 Hz, 1H); 7.85 (d, J = 8.8 Hz, 1H); 7.74 (d, J = 8.4 Hz, 1H); 7.58 (d, J = 8.0 Hz, 1H); 7.50 (d, J = 2.8 Hz, 2H); 7.20-7.18 (m, 1H); 6.64 (d, J = 8.8 Hz, 1H); 4.56- 4.52 (m, 2H); 4.47-4.43 (m, 2H); 4.33-4.26 (m, 1H); 3.38 (d, J = 12.8 Hz, 2H); 2.83 (t, J = 12.0 Hz, 2H); 1.77 (d, J = 12.4 Hz, 2H); 1.57 (s, 1H); 1.44-1.35 (m, 2H); 1.01 (d, J = 6.4 Hz, 3H). 24.3

(CDCl3, 400 MHz): 8.21 (m, 2H); 8.19 (dd, J = 2.4, 7.2 Hz, 2H); 8.09 (d, J = 9.2 Hz, 1H); 8.06 (d, J = 8.4 Hz, 1H); 7.75-7.69 (s, 1H); 6.68-6.66 (d, J = 9.2 Hz, 1H); 5.84 (s, 1H); 4.98 (s, 1H); 4.69 (m, 2H); 4.47-4.43 (m, 1H); 3.45 (d, J = 12.4 Hz, 2H); 2.89 (m, 2H); 2.42-2.41 (m, 1H); 2.06-2.04 (m, 4H) 24.4

(CD₃OD, 400 MHz): 8.31 (d, J = 9.6 Hz, 1H); 8.20 (dd, J = 2.4, 15.6 Hz, 2H); 7.87 (d, J = 8.0 Hz, 1H); 7.80-7.74 (m, 2H); 7.51-7.47 (m, 1H); 6.98 (d, J = 9.6 Hz. 1H); 4.90 (t, J = 9.2 Hz, 2H); 4.73 (t, J = 7.8 Hz, 2H); 4.60- 4.57 (m, 1H); 3.49 (d, J = 12.8 Hz, 2H); 3.14 (s, 3H); 3.01-2.91 (m, 5H); 2.43-2.38 (m, 1H); 1.94-1.85 (m, 4H). 24.5

(CD₃OD, 400 MHz): 8.33 (d, J = 9.6 Hz, 1H); 8.23 (d, J = 2.4 Hz, 1H); 8.19 (d, J = 2.4 Hz, 1H); 7.89 (d, J = 7.6 Hz, 1H); 7.79-7.76 (m, 2H); 7.53-7.49 (m, 1H); 7.00 (d, J = 9.6 Hz, 1H); 4.93-4.89 (m, 2H); 4.74 (t, J = 6.4 Hz, 2H); 4.60-4.56 (m, 1H); 3.50-3.47 (d, J = 12.8 Hz, 2H); 2.93-2.91 (m, 2H); 2.75 (s, 3H); 2.43-2.38 (m, 1H); 1.93- 1.98 (m, 4H). 24.6

(MeOD, 400 MHz): 8.32 (d, J = 9.6 Hz, 1H); 8.28 (d, J = 2.4 Hz, 1H); 8.22 (d, J = 2.4 Hz, 1H); 7.88 (d, J = 8.0 Hz, 1H); 7.80-7.74 (m, 2H); 7.52-7.48 (m, 1H); 6.99 (d, J = 9.6 Hz. 1H); 4.91 (d, J = 9.2 Hz, 2H); 4.75 (s, 2H); 4.63-4.59 (m, 1H); 3.79-3.73 (m, 4H); 3.23 (t, J = 5.2 Hz, 2H); 3.14 (t, J = 5.2 Hz, 2H); 2.15 (s, 3H). 24.7

(MeOD, 400 MHz): 8.07-8.02 (m, 2H); 7.94 (d, J = 9.2 Hz, 1H); 7.59 (d, J = 8.8 Hz, 2H); 7.47 (t, J = 6.4 Hz, 1H); 7.16 (t, J = 6.0 Hz, 1H); 6.69 (d, J = 9.2 Hz, 1H); 4.52 (s, 2H); 4.35-3.34 (m, 3H); 3.75-3.68 (m, 1H); 3.37- 3.29 (m, 2H); 2.89 (m, 2H); 1.95-1.89 (m, 2H); 1.69- 1.65 (m, 2H).

Example 25.1 2-methoxy-1-{4-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-1-yl}-ethanone

A solution of 2-azetidin-3-yl-3-chloro-pyrazine hydrochloride (190 mg, 0.5 mmol) and Et₃N (101 mg, 1 mL,) in DCM (15 mL) was added methoxy-acetyl chloride (purchased from ALDRICH) (81 mg, 0.75 mmol). The reaction was stirred at RT for 2 h. The reaction mixture was concentrated and purified by ISCO silica gel column (10% to 80% EtOAc in petroleum ether) give the product 2-methoxy-1-{4-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-1-yl}-ethanone (82 mg, 0.20 mmol, 39% yield).

The following Table 31A lists compounds of Examples 25.1 to 25.4, which were made analogous to Scheme 25 by using the appropriate materials and reaction conditions, which are listed in Table 31B. The NMR data of the Examples are listed in Table 31C.

TABLE 31A EXAMPLES 25.1 TO 25.4 ESI-MS Ex. # Structure Chemical Name (M + 1) IC₅₀ (uM) 25.1

2-Methoxy-1-{4-[3-(1- quinolin-2-yl-azetidin-3- yl)-pyrazin-2-yl]- piperidin-1-yl}-ethanone 418 0.0636 25.2

1-{4-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyrazin-2- yl]-piperidin-1-yl}- ethanone 388 0.0342 25.3

N-{4-[3-(1-Quinolin-2-yl- azetidin-3-yl)-pyrazin-2- yl]-phenyl}-acetamide 396 0.00236 25.4

1-(4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin- 2-yl)-5,6-dihydropyridin- 1(2H)-yl)ethanone 386 0.0006

TABLE 31B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 25.1 TO 25.4. Unless otherwise stated, all starting materials are commercially available from common vendors. Ex. # Starting Material 1 Starting Material 2 Reaction Condition 25.1

Et₃N, DCM 25.2 54 PREPARATION 16

Et₃N, DCM 25.3

Et₃N, DCM 25.4

Et₃N, DCM

TABLE 31C 1H NMR δ (PPM) DATA FOR EXAMPLES 25.1 TO 25.4 Ex. # Structure NMR 25.1

(CD₃OD, 400 MHz): 8.41-8.38 (m, 2H); 7.97 (t, J = 7.6 Hz, 1H); 7.64 (t, J = 8.8 Hz, 2H); 7.54-7.50 (m, 1H); 7.24-7.19 (m, 1H); 6.72 (t, J = 8.8 Hz, 1H); 4.64-4.44 (m, 6H); 4.22-4.11 (m, 2H); 3.97 (d, J = 13.2 Hz, 1H); 3.42 (s, 3H); 3.30-3.15 (m, 2H); 2.84-2.82 (m, 1H); 1.82- 1.78 (m, 4H) 25.2

(CDCl₃, 400 MHz): 8.35-8.33 (m, 2H); 7.85 (d, J = 8.8 Hz, 1H); 7.72 (d, J = 8.4 Hz, 1H); 7.55 (dd, J = 1.2, 8.0 Hz, 1H); 7.51-7.47 (m, 1H); 7.21-7.17 (m, 1H); 6.61 (d, J = 8.8 Hz, 1H); 4.73 (d, J = 12.4 Hz, 1H); 4.60-4.47 (m, 4H); 4.36-4.32 (m, 1H); 3.94-3.91 (m, 1H), 3.19-3.13 (m, 1H); 2.95-2.88 (m, 1H); 2.64-3.63 (m, 1H); 2.07 (s, 3H); 2.03-2.00 (m, 1H); 1.77-1.71 (m, 3H). 25.3

(CD₃OD, 400 MHz): 8.53-8.44 (m, 2H); 7.94 (d, J = 9.2 Hz, 1H); 7.69 (d, J = 8.4 Hz, 2H); 7.60-7.56 (m, 2H); 7.47-7.42 (m, 3H); 7.18 (t, J = 7.6 Hz, 1H); 6.64 (d, J = 9.2 Hz, 1H); 4.39- 4.33 (m, 5H); 2.08 (s, 3H). 25.4

(400 MHz, chloroform-d) 2.19 (d, J = 5.87 Hz, 3 H) 2.69 (br. S., 2H) 3.72 (t, J = 5.58 Hz, 1 H) 3.89 (t, J = 5.58 Hz, 1 H) 4.19 (d, J = 2.54 Hz, 1 H) 4.31 (d, J = 2.54 Hz, 1 H) 4.36-4.56 (m, 5 H) 5.77-5.88 (m, 1 H) 6.65 (dd, J = 8.90, 2.25 Hz, 1 H) 7.22 (t, J = 7.43 Hz, 1 H) 7.53 (t, J = 7.63 Hz, 1 H) 7.61 (d, J = 8.02 Hz, 1 H) 7.74 (d, J = 8.41 Hz, 1 H) 7.89 (dd, J = 8.90, 3.03 Hz, 1 H) 8.42 (t, J = 2.93 Hz, 1 H) 8.49 (d, J = 2.54 Hz, 1H).

Examples 26.1, 26.2, and 26.3 Racemic Mixtures and Separated Enantiomers, Absolute Stereochemistry not Further Determined Step 1. 1-{1-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-ethanone

To a solution of 2-[3-(3-chloro-pyrazin-2-yl)-azetidin-1-yl]-quinoline (80 mg, 0.27 mmol) and 1-piperidin-4-yl-ethanone (WUXI APPTEC) (34.3 mg, 0.27 mmol) in DMSO (5 mL) was added Et₃N (54.5 mg, 0.54 mmol). The reaction mixture was stirred at 100° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (20 mL×3). The combined organic extracts were washed with water (30 mL) and brine (30 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel to give 1-{1-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-ethanone (65.8 mg, 0.17 mmol, yield 62.9%).

ESI-MS (M+1): 388 calc. for C₂₃H₂₅N₅O 387.

Step 2. (S & R)-1-{1-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-ethanol

A solution of 1-{1-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-ethanone (96.75 mg, 0.25 mmol) in MeOH (10 mL) was added NaBH₄ (37 mg, 1 mmol). The mixture was stirred at RT for 2 h. The reaction mixture was concentrated to give the product (racemic)-1-{1-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-ethanol (76 mg, 0.20 mmol, yield 78%).

ESI-MS (M+1): 390. PDE10 IC₅₀ (uM): 0.00805.

(CD₃OD, 400 MHz): 8.31 (d, J=9.2 Hz, 1H); 8.22-8.16 (m, 2H); 7.88 (d, J=7.6 Hz, 1H); 7.78-7.75 (m, 2H); 7.52-7.48 (m, 1H); 6.98 (d, J=9.6 Hz, 1H); 4.89 (d, J=7.2 Hz, 1H); 4.72 (t, J=7.2 Hz, 2H); 4.56-4.55 (m, 1H); 3.60-3.57 (m, 1H); 3.47 (d, J=12.8 Hz, 2H); 2.87-2.84 (m, 2H); 1.98-1.97 (m, 1H); 1.77-1.76 (m, 1H); 1.56-1.48 (m, 3H); 1.47 (d, J=3.2 Hz, 1H); 1.20 (d, J=6.4 Hz, 3H).

Examples 26.2 and 26.3 Step 3. Separated R and S-1-{1-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-ethanol

The racemic mixture of 1-{1-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-ethanol (450 mg, 1.16 mmol) was separated by chiral prep. HPLC (Column: Chiralpak AD-H 250*30 mm, 5u; Mobile phase: 70% hexane in EtOH (0.05% diethyl amine); Flow rate: 20 mL/minute) to give their separated enantiomers (152 mg, 0.41 mmol, 34% yield) and 182 mg, 0.47 mmol, 41% yield).

Separated Isomer Example 26.2

ESI-MS (M+1): 390. PDE10 IC₅₀ (uM): 0.00237.

¹H NMR δ (ppm) (CDCl₃, 400 MHz): 8.16-8.08 (m, 2H); 7.88 (d, J=8.8 Hz, 1H); 7.73 (d, J=8.4 Hz, 1H); 7.62-7.59 (m, 1H); 7.55-7.51 (m, 1H); 7.24-7.20 (m, 1H); 6.66 (d, J=8.8 Hz, 1H); 4.57-4.53 (m, 2H); 4.48-4.45 (m, 2H); 4.34-4.32 (m, 1H); 3.70-3.68 (m, 1H); 3.50-3.46 (m, 2H); 2.88-2.81 (m, 2H); 2.02-1.99 (m, 1H); 1.79-1.76 (m, 1H); 1.58-1.49 (m, 3H); 1.25 (d, J=6.4 Hz, 3H).

Separated Isomer Example 26.3

ESI-MS (M+1): 390. PDE10 IC₅₀ (uM): 0.00262.

¹H NMR δ (ppm) (CDCl₃, 400 MHz): 8.15-8.08 (m, 2H); 7.88 (d, J=8.8 Hz, 1H); 7.73 (d, J=8.4 Hz, 1H); 7.61-7.55 (m, 1H); 7.53-7.51 (m, 1H); 7.23-7.19 (m, 1H); 6.66 (d, J=9.2 Hz, 1H); 4.57-4.53 (m, 2H); 4.48-4.44 (m, 2H); 4.35-4.29 (m, 1H); 3.69-3.67 (m, 1H); 3.49-3.46 (m, 2H); 2.87-2.81 (m, 2H); 2.02-1.99 (m, 1H); 1.79-1.76 (m, 1H); 1.57-1.51 (m, 3H); 1.25 (d, J=6.4 Hz, 3H).

Example 27.1 2-fluoro-5-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-phenol

To a solution of 2-{3-[3-(4-fluoro-3-methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-quinoline (193 mg, 0.5 mmol) in 1,2-dichloro-ethane (5 mL) was added BBr₃ (250 mg, 1.0 mmol). The reaction mixture was stirred at RT for 2 h. The reaction mixture was diluted with water, extracted with DCM (2×30 mL). The combined organic extracts were washed with water (20 mL) and brine (20 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel to give 2-fluoro-5-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-phenol (111 mg, 0.31 mmol yield 62%).

ESI-MS (M+1): 373. PDE10 IC₅₀ (uM): 0.00284.

¹H NMR δ (ppm) (CD₃OD, 400 MHz): 8.63-8.57 (m, 2H); 8.29 (d, J=8.0 Hz, 1H); 7.87 (d, J=8.0 Hz, 1H); 7.79-7.72 (m, 2H); 7.52-7.48 (m, 1H); 7.26-7.21 (m, 1H); 7.15-7.13 (m, 1H); 7.00-6.96 (m, 1H); 6.93 (d, J=9.2 Hz, 1H); 4.68-4.64 (m, 5H).

Example 28.1 (1-{3-[1-(6-methyl-quinolin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-methanol

To a solution of [1-(3-azetidin-3-yl-pyrazin-2-yl)-piperidin-4-yl]-methanol hydrochloride (284 mg, 1.0 mmol) and 2-chloro-6-methyl-quinoline (purchased from ALDRICH) (177 mg, 1.0 mmol) in DMF (15 mL) was added Cs₂CO₃ (650 mg, 2.0 mmol). The reaction mixture was stirred at 100° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (2×30 mL). The combined organic extracts were washed with water (20 mL) and brine (20 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography (EtOAc:Petrol ether=5:1) on silica gel to give (1-{3-[1-(6-methyl-quinolin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-methanol (102 mg, 0.26 mmol 26%).

The following Table 32A lists compounds of Examples 28.1 to 28.18, which were made analogous to Scheme 28 by using the appropriate materials and reaction conditions, which are listed in Table 32B. The NMR data of the Examples are listed in Table 32C.

TABLE 32A EXAMPLES 28.1 TO 28.18 ESI-MS Ex. # Structure Chemical Name (M + 1) IC₅₀ (uM) 28.1

(1-{3-[1-(6-Methyl-quinolin- 2-yl)-azetidin-3-yl]-pyrazin- 2-yl}-piperidin-4-yl)- methanol 390 0.00117 28.2

(1-{3-[1-(7-Fluoro-quinolin- 2-yl)-azetidin-3-yl]-pyrazin- 2-yl}-piperidin-4-yl)- methanol 394 0.0001 28.3

(1-{3-[1-(6-Fluoro-quinolin- 2-yl)-azetidin-3-yl]-pyrazin- 2-yl}-piperidin-4-yl)- methanol 394 0.0037 28.4

{1-[3-(1-[1,8]Naphthyridin- 2-yl-azetidin-3-yl)-pyrazin- 2-yl]-piperidin-4-yl}- methanol 377 0.0419 28.5

(1-{3-[1-(6-Chloro-quinolin- 2-yl)-azetidin-3-yl]-pyrazin- 2-yl}-piperidin-4-yl)- methanol 410 0.00116 28.6

(1-{3-[1-(6-Chloro- quinoxalin-2-yl)-azetidin-3- yl]-pyrdzin-2-yl}-piperidin- 4-yl)-methanol 411 0.0144 28.7

(1-{3-[1-(6-Methyl-pyridin- 2-yl)-azetidin-3-yl]-pyrazin- 2-yl}-piperidin-4-yl)- methanol 340 0.217 28.8

(1-{3-[1-(5-Chloro-pyridin- 2-yl)-azetidin-3-yl]-pyrazin- 2-yl}-piperidin-4-yl)- methanol 360 0.490 28.9

(1-(3-(1-(5-bromopyridin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidin-4-yl)methanol 404 0.466 28.10

(1-(3-(1-(8-methylquinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidin-4-yl)methanol 390 0.446 28.11

(1-{3-[1-(8-Fluoro-quinolin- 2-yl)-azetidin-3-yl]-pyrazin- 2-yl}-piperidin-4-yl)- methanol 394 0.00228 28.12

(1-(3-(1-(8-chloroquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidin-4-yl)methanol 410 0.0233 28.13

(1-{3-[1-(8-Chloro- quinazolin-2-yl)-azetidin-3- yl]-pyrazin-2-yl}-piperidin- 4-yl)-methanol 411 0.0117 28.14

(1-{3-[1-(7-Chloro- quinazolin-2-yl)-azetidin-3- yl]-pyrazin-2-yl}-piperidin- 4-yl)-methanol 411 0.0001 28.15

(1-{3-[1-(6-Chloro- quinazolin-2-yl)-azetidin-3- yl]-pyrazin-2-yl}-piperidin- 4-yl)-methanol 411 0.0068 28.16

(1-{3-[1-(5-Chloro- quinazolin-2-yl)-azetidin-3- yl]-pyrazin-2-yl}-piperidin- 4-yl)-methanol 411 28.17

(1-{3-[1-(7-Chloro- quinoxalin-2-yl)-azetidin-3- yl]-pyrazin-2-yl}-piperidin- 4-yl)-methanol 411 0.0005 28.18

2-[3-(3-Piperidin-1-yl- pyrazin-2-yl)-azetidin-1-yl]- benzothiazole 352 >10

TABLE 32B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 28.1 TO 28.18. Unless otherwise stated, all starting materials are commercially available from common vendors. Ex. # Starting Material 1 Starting Material 2 Reaction Condition 28.1

Cs₂CO₃, DMF, 100° C. 28.2 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.3 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.4 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.5 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.6 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.7 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.8 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.9 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.10 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.11 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.12 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.13 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.14 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.15 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.16 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.17 37 PREPARATION 11

Cs₂CO₃, DMF, 100° C. 28.18

K₂CO₃, iPrOH/H₂O 160° C., μW

TABLE 32C 1H NMR δ (PPM) DATA FOR EXAMPLES 28.1 TO 28.18 Ex. # Structure NMR 28.1

(CDCl₃, 400 MHz): 8.14-8.06 (m, 2H); 7.79 (d, J = 8.8 Hz, 1H); 7.64 (d, J = 9.2 Hz, 1H); 7.37-7.35 (m, 2H); 6.62 (d, J = 9.2 Hz, 1H); 4.54-4.50 (m, 2H); 4.45-4.41 (m, 2H); 4.33-4.25 (m, 1H); 3.58-3.56 (m, 2H); 3.45- 3.42 (m, 2H); 2.88-2.81 (m, 2H); 2.43 (s, 3H); 1.89- 1.85 (m, 2H); 1.75-1.65 (m, 1H); 1.50-1.46 (m, 2H). 28.2

(CDCl₃, 400 MHz): 8.10-8.09 (m, 1H); 8.03-8.02 (m, 1H); 7.77 (d, J = 8.8 Hz, 1H); 7.51-7.47 (m, 1H); 7.30- 7.27 (m, 1H); 6.93-6.88 (m, 1H); 6.54-6.51 (m, 1H); 4.50-4.46 (m, 2H); 4.41-4.37 (m, 2H); 4.28-4.23 (m, 1H); 3.54-3.53 (m, 2H); 3.38 (d, J = 12.8 Hz, 2H); 1.85-1.82 (m, 2H); 1.69-1.64 (m, 1H); 1.53-1.37 (m, 1H) 28.3

(CDCl₃, 400 MHz): 8.16-8.09 (m, 2H): 7.82 (d, J = 8.8 Hz, 1H); 7.73-7.69 (m, 1H); 7.33-7.28 (m, 1H); 7.27- 7.23 (m, 1H); 6.69 (d, J = 8.8 Hz, 1H); 4.56-4.52 (m, 2H); 4.46-4.43 (m, 2H); 4.36-4.30 (m, 1H); 3.60 (d, J = 6.4 Hz, 2H); 3.47-3.44 (m, 2H); 2.91-2.84 (m, 2H); 1.92-1.88 (m, 2H); 1.75-1.69 (m, 1H); 1.53-1.43 (m, 2H). 28.4

(CD3OD, 400 MHz): 8.07 (s, 1H); 8.16-8.14 (m, 2H); 8.10 (d, J = 2.4 Hz, 1H); 8.02 (d, J = 9.2 Hz, 1H); 7.26- 7.23 (m, 1H); 6.83 1(d, J = 9.2 Hz, 1H); 4.55 (m, 2H); 4.37 (m, 3H); 3.50-3.43 (m, 4H); 2.89-2.83 (m, 2H); 1.89-1.86 (m, 2H); 1.68-1.64 (m, 1H); 1.50-1.40(m, 2H). 28.5

(CDCl₃, 400 MHz): 8.18-8.10 (m, 2H); 7.80 (d, J = 4.8 Hz, 1H); 7.67 (d, J = 5.2 Hz, 1H); 7.59 (s, 1H); 7.49- 7.46 (m, 1H); 6.68 (d, J = 8.8 Hz, 1H); 4.58-4.54 (m, 2H); 4.49-4.46 (m, 2H); 4.37-4.30 (m, 1H); 3.62 (d, J = 6.4 Hz, 2H); 3.46 (d, J = 12.8 Hz, 2H); 2.92-2.86 (m, 2H); 1.93-1.90 (m, 2H); 1.76-1.69 (m, 1H); 1.54-1.44 (m, 2H). 28.6

(CDCl₃, 400 MHz): 8.20-8.13 (m, 2H); 8.13 (t, J = 2.4 Hz, 1H); 7.89 (d, J = 2.4 Hz, 1H); 7.65 (d, J = 8.8 Hz, 1H); 7.54-7.51 (m, 1H); 4.67-4.62 (m, 2H); 4.59-4.55 (m, 2H); 4.44-4.37 (m, 1H); 3.61 (d, J = 6.0 Hz, 2H); 3.46 (d, J = 12.8 Hz, 2H); 2.94-2.87(m, 2H); 1.94-1.91 (m, 2H); 1.81-1.71 (m, 1H); 1.55-1.48 (m, 2H). 28.7

(CDCl₃, 400 MHz): 8.09 (s, 1H); 8.00 (s, 1H); 7.30- 7.26 (m, 1H); 6.42-6.40 (m, 1H); 6.12-6.10 (m, 1H); 4.32(s, 2H); 4.21-4.20 (m, 3H); 3.53-3.51 (m, 2H); 3.39-3.36 (m, 2H); 2.81-2.75 (m, 2H); 2.33 (s, 3H); 1.82-1.79 (m, 2H); 1.65-1.63 (m, 1H); 1.45-1.34 (m, 2H); 1.18-1.17 (m, 1H). 28.8

(CDCl₃, 400 MHz): 8.10-8.09 (m, 1H); 8.02-8.01 (m, 2H); 7.35-7.32 (m, 1H); 6.24 (d, J = 8.8 Hz, 1H); 4.33- 4.29 (m, 2H); 4.25-4.19 (m, 3H); 3.51 (d, J = 6.0 Hz, 2H); 3.35 (d, J = 12.4 Hz, 2H); 2.81-2.75 (m, 2H); 1.83-1.80 (m, 2H); 1.70-1.59 (m, 1H); 1.43-1.36 (m, 2H). 28.9

(CDCl₃, 400 MHz): 8.16 (s, 2H); 8.08 (d, J = 3.2 Hz, 1H); 6.27 (d, J = 8.8 Hz, 1H); 4.39-4.35 (m, 2H); 4.32- 4.27 (m, 3H); 3.58 (s, 2H); 3.43-3.40 (m, 3H); 2.88- 2.82 (m, 2H); 2.05-2.00 (m, 1H); 1.89-1.86 (m, 2H); 1.74-1.68 (m, 1H); 1.50-1.40 (m, 1H). 28.10

(CDCl₃, 400 MHz): 8.19-8.11 (m, 2H); 7.89 (d, J = 8.8 Hz, 1H); 7.49 (d, J = 8.0 Hz, 1H); 7.43 (d, J = 6.8, 1H); 7.15 (t, J = 7.6 Hz, 1H); 6.69 (d, J = 8.8 Hz, 1H); 4.57- 4.53 (m, 2H); 4.47-4.43 (m, 2H); 4.38-4.31 (m, 1H); 3.63-3.61 (m, 2H); 3.51-3.48 (m, 2H); 2.93-2.87 (m, 2H); 2.67 (s, 3H); 1.94-1.91 (m, 2H); 1.82-1.62 (m, 1H); 1.55-1.45 (m, 2H). 28.11

(CDCl₃, 400 MHz): 8.09-8.02 (m, 2H); 7.82-7.83 (m, 1H); 7.32 (d, J = 8.0 Hz, 1H); 7.21-7.16 (m, 1H); 7.07- 7.02 (m, 1H); 6.63 (d, J = 8.8 Hz, 1H); 4.53-4.49 (m, 2H); 4.45-4.41 (m, 2H); 4.29-4.23 (m, 1H); 3.53 (d, J = 6.4 Hz, 2H); 3.39 (d, J = 12.8 Hz, 2H); 2.84-2.77 (m, 2H); 1.85-1.81 (m, 2H); 1.68-1.64 (m, 1H). 1.63-1.36 (m, 2H) 28.12

(CDCl₃, 400 MHz): 8.09-8.02 (m, 2H); 7.80 (d, J = 8.8 Hz, 1H); 7.60-7.58 (m, 1H); 7.44-7.43 (m, 1H); 7.04 (t, J = 7.6 Hz, 1H); 6.63 (d, J = 8.8 Hz, 1H); 4.53-4.49 (m, 2H); 4.45-4.41 (m, 2H); 4.28-4.23 (m, 1H); 3.54 (d, J = 6.4 Hz, 2H); 3.39 (d, J = 12.0 Hz, 2H); 2.81 (m, 2H); 1.86-1.83 (m, 2H); 1.71-1.63 (m, 1H); 1.46-1.36 (m, 2H). 28.13

(CDCl₃, 400 MHz): 8.99 (s, 1H); 8.16-8.15 (m, 1H); 8.08-8.07 (m, 1H); 7.76-7.74 (m, 1H); 7.58-7.56 (m, 1H); 7.13-7.09(m, 1H); 4.64-4.57 (m, 4H); 4.31-4.27 (m, 1H); 3.58-3.55 (m, 2H); 3.45-3.41 (m, 2H); 2.88- 2.82 (m, 2H); 2.33 (s, 1H); 1.89-1.86 (m, 2H); 1.73- 1.66 (m, 1H); 1.50-1.40 (m, 2H) 28.14

(CDCl₃, 400 MHz): 8.91 (s, 1H); 8.10 (d, J = 2.8 Hz, 1H); 8.03 (d, J = 2.8 Hz, 1H); 7.56-7.51 (m, 2H); 7.11- 7.09 (m, 1H); 4.57-4.52 (m, 2H); 4.49-4.45 (m, 2H); 4.27-4.19 (m, 1H); 3.53 (d, J = 6.4 Hz, 2H); 3.38 (d, J = 12.4 Hz, 2H); 2.84-2.78 (m, 2H); 1.84-1.81 (m, 2H); 1.71-1.62 (m, 1H); 1.47-1.43 (m, 2H) 28.15

(CDCl₃, 400 MHz): 8.96 (s, 1H); 8.18-8.09 (m, 2H); 7.66-7.58 (m, 3H); 4.61-4.54 (m, 4H); 4.35-4.25 (m, 1H); 3.61-3.59 (m, 2H); 3.46-3.43 (m, 2H); 2.92-2.85 (m, 2H); 1.91-1.89 (m, 2H); 1.75-1.71 (m, 1H); 1.52- 1.47 (m, 2H). 28.16

(CDCl₃, 400 MHz): 9.42 (s, 1H); 8.20 (d, J = 2.8 Hz, 1H); 8.12 (d, J = 2.4 Hz, 1H); 7.57-7.54 (m, 2H); 7.25- 7.23 (m, 1H); 4.67-4.63 (m, 2H); 4.59-4.55 (m, 2H); 4.35-4.31 (m, 1H); 3.64-3.62 (m, 2H); 3.48-3.45 (m, 2H); 2.93-2.86 (m, 2H); 193-1.90 (m, 2H); 1.78-1.72 (m, 1H); 1.56-1.42(m, 3H). 28.17

(CDCl₃, 400 MHz): 8.14 (s, 1H); 8.12-8.11 (m, 1H); 8.06-8.05 (m, 1H); 7.73 (d, J = 8.8 Hz, 1H); 7.63-7.62 (m, 1H); 7.26-7.24 (m, 1H); 4.58-4.51 (m, 2H); 4.49- 4.47 (m, 2H); 4.36-4.28 (m, 1H); 3.54 (d, J = 4.4 Hz, 2H); 3.38-3.35 (m, 2H); 2.86-2.79 (m, 2H); 1.85-1.83 (m, 2H); 1.73-1.62 (m, 1H); 1.47-1.37 (m, 2H) 28.18

(CDCl₃, 400 MHz): 8.70-8.69 (m, 1 H); 8.42-8.41 (m, 1 H); 7.57-7.55 (m, 1H); 7.47-7.45 (m, 1 H); 7.38-7.34 (m, 1 H); 7.26-7.22 (m, 1 H); 5.21-5.18 (m, 1H); 4.72- 4.70 (m, 1 H)(; 4.30-4.16 (m, 2 H); 4.06-3.95 (m, 3 H); 3.83-3.80 (m, 1 H); 3.46-3.41 (m, 1 H); 2.27-2.12 (m, 1 H); 2.08-1.94 (m, 4 H); 1.61-1.58 (m, 1 H).

Example 29.1 2-{3-[3-(3-methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-8-methyl-quinoline

To a solution of 2-azetidin-3-yl-3-(3-methoxy-phenyl)-pyrazine hydrochloride (138 mg, 0.50 mmol) and 2-chloro-quinoline (84 mg, 0.50 mmol) in DMF (6 mL) was added Cs₂CO₃ (325 mg, 1.0 mmol). The reaction mixture was stirred at 110° C. overnight. The reaction mixture was diluted with water, extracted with EtOAc (30 mL×2). The combined organic extracts were washed with water (30 mL) and brine (30 mL), dried over Na₂SO₄ and filtered. The filtrate was evaporated in vacuo and the residue was purified by flash column chromatography on silica gel (20% to 40% EtOAc in petroleum ether) to give 2-{3-[3-(3-methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-8-methyl-quinoline (118 mg, 0.31 mmol, 63.35%).

The following Table 33A lists compounds of Examples 29.1 to 29.18, which were made analogous to Scheme 29 by using the appropriate materials and reaction conditions, which are listed in Table 33B. The NMR data of the Examples are listed in Table 33C.

TABLE 33A EXAMPLES 29.1 TO 29.18 ESI-MS IC₅₀ Ex. # Structure Chemical Name (M + 1) (uM) 29.1

2-(3-(3-(3-methoxyphenyl)pyrazin- 2-yl)azetidin-1-yl)-8- methylquinoline 383 0.997 29.2

6-Chloro-2-{3-[3-(3-methoxy- phenyl)-pyrazin-2-yl]-azetidin-1- yl}-quinazoline 404 0.0750 29.3

8-Chloro-2-{3-[3-(3-methoxy- phenyl)-pyrazin-2-yl]-azetidin-1- yl}-quinoline 403 0.111 29.4

7-Fluoro-2-{3-[3-(3-methoxy- phenyl)-pyrazin-2-yl]-azetidin-1- yl}-quinoline 387 0.00122 29.5

2-{3-[3-(3-Methoxy-phenyl)- pyrazin-2-yl]-azetidin-1-yl}-6- methyl-quinoline 383 0.0061- 29.6

2-{3-[3-(3-Methoxy-phenyl)- pyrazin-2-yl]-azetidin-1-yl}- [1,8]naphthyridine 370 0.0794 29.7

8-Chloro-2-{3-[3-(3-methoxy- phenyl)-pyrazin-2-yl]-azetidin-1- yl}-quinazoline 404 29.8

5-Chloro-2-{3-[3-(3-methoxy- phenyl)-pyrazin-2-yl]-azetidin-1- yl}-quinazoline 404 29.9

2-(3-(3-(3-methoxyphenyl)pyrazin- 2-yl)azetidin-1-yl)-4- phenylpyrimidine 396 4.3 29.10

2-(3-(3-(3-methoxyphenyl)pyrazin- 2-yl)azetidin-1-yl)benzo[d]thiazole 375 0.016 29.11

6-methoxy-2-(3-(3-(3- methoxyphenyl)pyrazin-2- yl)azetidin-1-yl)benzo[d]thiazole 405 0.010 29.12

2-(3-(3-(3-methoxyphenyl)pyrazin- 2-yl)azetidin-1-yl)-1,6- naphthyridine 370 0.008 29.13

6-chloro-2-(3-(3-(3- methoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 403 0.0049 29.13

6-fluoro-2-(3-(3-(3- methoxyphenyl)pyrazin-2- yl)azetidin-1-yl)benzo[d]thiazole 393 0.029 29.14

2-(3-(3-(3-methoxyphenyl)pyrazin- 2-yl)azetidin-1-yl)quinoline-3- carbonitrile 394 0.0062 29.15

1-[3-(3-Phenyl-pyrazin-2-yl)- azetidin-1-yl]-phthalazine 340 1.9100 29.16

6-chloro-2-(3-(3-phenylpyrazin-2- yl)azetidin-1-yl)-1H- benzo[d]imidazole 362 0.0504 29.17

2-(3-(3-phenylpyrazin-2-yl)azetidin- 1-yl)-1H-benzo[d]imidazole 327 0.191 29.18

2-((3-(3-phenylpyrazin-2- yl)azetidin-1-yl)methyl)-1H- benzo[d]imidazole 342 1.07

TABLE 33B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 29.1 TO 29.18. Unless otherwise stated, all starting materials are commercially available from common vendors. Ex. # Starting Material 1 Starting Material 2 Reaction Condition 29.1

Cs₂CO₃, DMF, 100° C. 29.2 34 PREPARATION 10

Cs₂CO₃, DMF, 100° C. 29.3 34 PREPARATION 10

Cs₂CO₃, DMF, 100° C. 29.4 34 PREPARATION 10

Cs₂CO₃, DMF, 100° C. 29.5 34 PREPARATION 10

Cs₂CO₃, DMF, 100° C. 29.6 34 PREPARATION 10

Cs₂CO₃, DMF, 100° C. 29.7 34 PREPARATION 10

Cs₂CO₃, DMF, 100° C. 29.8 34 PREPARATION 10

Cs₂CO₃, DMF, 100° C. 29.9 34 PREPARATION 10

DMSO, 130-145° C., μW 29.10 34 PREPARATION 10

DMSO, 130-145° C., μW 29.11 34 PREPARATION 10

DMSO, 130-145° C., μW 29.12 34 PREPARATION 10

DMSO, 145-155° C., μW 29.13 34 PREPARATION 10

DMSO, 145-155° C., μW 29.13 34 PREPARATION 10

DMSO, 145-155° C., μW 29.14 34 PREPARATION 10

DMSO, 100° C., μW 29.15

Cs₂CO₃, DMF 120° C. 29.16

K₂CO₃, i-PrOH, H₂O, MW, 160° C. 29.17

K₂CO₃, i-PrOH, H₂O, MW, 160° C. 29.18

K₂CO₃, i-PrOH, H₂O, MW, 160° C.

TABLE 33C 1H NMR δ (PPM) DATA FOR EXAMPLES 29.1 TO 29.18 Ex. # Structure NMR 29.1

(CDCl₃, 400 MHz): 8.59-8.53 (m, 2H); 7.85 (d, J = 8.8 Hz, 1H); 7.47-7.40 (m, 3H); 7.14- 7.10 (m, 1H); 7.08-7.03 (m, 3H); 6.62 (d, J = 8.8 Hz, 1H); 4.44-4.37 (m, 5H); 3.90 (s, 3H); 2.64 (s, 3H). 29.2

(CDCl₃, 400 MHz): 9.07 (s, 1H); 8.60-8.59 (m, 2H); 7.88-7.86 (m, 1H); 7.78-7.74 (m, 2H); 7.43-7.41 (m, 1H); 7.05-6.98 (m, 3H); 4.75-4.74 (m, 4H); 4.45-4.43 (m, 1H); 3.87 (s, 3H). 29.3

(CDCl₃, 400 MHz): 8.61 (s, 1H); 8.56 (s, 1H); 7.87 (d, J = 8.8 Hz, 1H); 7.67 (d, J = 7.6 Hz, 1H); 7.53 (d, J = 8.0 Hz, 1H); 7.48-7.44 (m, 1H); 7.15-7.11 (m, 1H); 7.09-7.06 (m, 3H) 6.68 (d, J = 8.8 Hz, 1H); 4.55-4.42 (m, 5H); 3.92 (s, 3H) 29.4

(CDCl₃, 400 MHz): 8.61-8.56 (m, 2H); 7.86- 7.83 (m, 1H); 7.59-7.55 (m, 1H); 7.47-7.43 (m, 1H); 7.38-7.35 (m, 1H); 7.09-7.05 (m, 3H); 7.01-6.91 (m, 1H); 6.58-6.65 (m, 1H); 4.48- 4.43 (m, 5H); 3.91 (s, 3H). 29.5

(CDCl₃, 400 MHz): 8.60-8.55 (m, 2H); 7.82 (d, J = 8.8 Hz, 1H); 7.71-7.69 (m, 1H); 7.47- 7.43 (m, 1H); 7.41-7.39 (m, 2H); 7.09-7.04 (m, 3H); 6.62 (d, J = 8.8 Hz, 1H); 4.49-4.43 (m, 5H); 3.91 (s, 3H); 2.46 (s, 3H). 29.6

(CDCl₃, 400 MHz): 8.59-8.54 (m, 2H); 7.77 (d, J = 8.8 Hz, 1H); 7.64 (d, J = 9.2 Hz, 1H); 7.57-7.56 (m, 1H); 7.47-7.41 (m, 2H); 7.07- 7.03 (m, 3H); 6.62 (d, J = 8.8 Hz, 1H); 4.46- 4.40 (m, 5H); 3.89 (s, 3H). 29.7

(CDCl₃, 400 MHz): 9.00-8.99 (m, 1H); 8.61- 8.50 (m, 2H); 7.77-7.74 (m, 1H); 7.59-7.56 (m, 1H); 7.43-7.40 (m, 1H); 7.14-7.10 (m, 1H); 7.07-7.01 (m, 3H); 4.58-4.50 (m, 4H); 4.39- 4.36 (m, 1H); 3.87 (s, 3H). 29.8

(CDCl₃, 400 MHz): 9.54 (s, 1H); 8.65-8.63 (m, 2H); 7.83-7.80 (m, 2H); 7.48-7.44 (m, 2H); 7.08-6.99 (m, 3H); 4.82-4.81 (m, 4H); 4.50-4.47 (m, 1H); 3.89 (s, 3H). 29.9

(400 MHz, DMSO-d₆) 3.78-3.92 (m, 3H) 4.16-4.50 (m, 5H) 7.06-7.17 (m, 3H) 7.26 (d, J = 5.09 Hz, 1H) 7.42-7.56 (m, 4H) 8.06- 8.16 (m, 2 H) 8.42 (d, J = 5.09 Hz, 1H) 8.64 (d, J = 2.15 Hz, 1H) 8.70 (d, J = 2.35 Hz, 1H). 29.10

(400 MHz, DMSO-d₆) 3.84 (s, 3H) 4.24- 4.41 (m, 4H) 4.44-4.57 (m, 1H) 7.01-7.17 (m, 4H) 7.24-7.33 (m, 1H) 7.42-7.52 (m, 2 H) 7.78 (d, J = 7.82 Hz, 1H) 8.66 (d, J = 2.35 Hz, 1H) 8.72 (d, J = 2.35 Hz, 1H) 29.11

(400 MHz, DMSO-d₆) 3.71-3.79 (m, 3 H) 3.84 (s, 3 H) 4.21-4.35 (m, 4H) 4.43-4.55 (m, 1H) 6.89 (dd, J = 8.80, 2.54 Hz, 1H) 7.04- 7.15 (m, 3H) 7.34-7.43 (m, 2H) 7.44-7.51 (m, 1H) 8.65 (d, J = 2.35 Hz, 1H) 8.71 (d, J = 2.35 Hz, H) 29.12

(400 MHz, DMSO-d₆) 3.87 (s, 3H) 4.28-4.49 (m, 5H) 6.83 (d, J = 9.00 Hz, 1H) 7.06-7.19 (m, 3 H) 7.38 (d, J = 5.87 Hz, 1H) 7.49 (t, J = 8.02 Hz, 1H) 8.13 (d, J = 9.00 Hz, 1H) 8.42 (d, J = 5.67 Hz, 1H) 8.66 (d, J = 2.35 Hz, 1H) 8.71 (d, J = 2.15 Hz, 1 H) 8.93 (s, 1H) 29.13

(400 MHz, DMSO-d₆) 8.69 (d, J = 2.35 Hz, 1H), 8.64 (d, J = 2.35 Hz, 1H), 8.01 (d, J = 9.00 Hz, 1H), 7.82 (d, J = 2.15 Hz, 1H), 7.42- 7.60 (m, 3H), 7.06-7.19 (m, 3H), 6.81 (d, J = 9.00 Hz, 1H), 4.36-4.47 (m, 1H), 4.20-4.36 (m, 4H), 3.85 (s, 3H) 29.13

(400 MHz, DMSO-d₆) 8.71 (d, J = 2.54 Hz, 1H), 8.65 (d, J = 2.35 Hz, 1H), 7.71 (dd, J = 2.74, 8.80 Hz, 1H), 7.41-7.49 (m, 2H), 7.05- 7.17 (m, 4H), 4.49 (s, 1H), 4.23-4.38 (m, 4H), 3.83 (s, 3H) 29.14

(400 MHz, DMSO-d₆) 8.73 (s, 1H), 8.67 (d, J = 2.35 Hz, 1H), 8.61 (d, J = 2.35 Hz, 1H), 7.77 (d, J = 8.02 Hz, 1H), 7.63-7.69 (m, 1H), 7.54-7.59 (m, 1H), 7.41-7.47 (m, 1H), 7.30 (t, J = 7.43 Hz, 1H), 7.04-7.13 (m, 3H), 4.43-4.55 (m, 4H), 4.33-4.42 (m, 1H), 3.81 (s, 3H) 29.15

(CD₃OD, 400 MHz): 8.84 (S, 1h); 8.65 (d, J = 2.4 Hz, 1H); 8.53 (d, J = 2.4 Hz, 1H); 8.03- 8.00 (m, 1H); 7.92-7.80 (m, 3H); 7.57-7.50 (m, 5H); 4.77-4.71 (m, 4H); 4.49-4.46 (m, 1H). 29.16

(CDCl₃, 400 MHz): 8.54-8.53 (m, 1H); 8.42 (s, 1H); 7.54-7.53 (m, 3H); 7.35-7.32 (m, 2H); 7.26-7.20 (m, 1H); 7.11-7.09 (m, 1H); 6.97- 6.95 (m, 1H); 4.46-4.42 (m, 2H); 4.18-4.15 (m, 2H); 4.03-4.00 (m, 1H). 29.17

(MeOD, 400 MHz): 8.66-8.65 (m, 1H); 8.55- 8.54 (m, 1H); 7.58-7.52 (m, 5H); 7.22-7.19 (m, 2H); 7.01-6.98 (m, 2H); 4.51-4.45 (m, 1H), 4.38-4.30 (m, 4H). 29.18

(MeOD, 400 MHz): 8.67-8.65 (m, 1H); 8.60- 8.58 (m, 1H); 7.67-7.63 (m, 2H); 7.55-7.47 (m, 5H); 7.39-7.36 (m, 2H); 4.81 (s, 2H); 4.55- 4.48 (m, 5H).

Example 30.1 3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzamide

A mixture of 3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzonitrile (0.072 g, 0.198 mmol), potassium hydroxide (0.111 g, 1.981 mmol, v/w) and t-BuOH (2 mL, Acros) was heated at 80° C. overnight. LCMS showed the product. The mixture was diluted with water and extracted with a mixture of CHCl₃:i-PrOH (3:1) three times. The combined organic layers were dried over Na₂SO₄ and concentrated in vacuo. The product was obtained as a white solid (75 mg, 99%).

The following Table 34A lists compounds of Examples 30.1 to 30.4, which were made analogous to Scheme 30 by using the appropriate materials and reaction conditions, which are listed in Table 34B. The NMR data of the Examples are listed in Table 34C.

TABLE 34A EXAMPLES 30.1 TO 30.4 ESI-MS Ex. # Structure Chemical Name (M + 1) IC₅₀ (μM) 30.1

3-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)benzamide 382 0.0008 30.2

4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2 yl)benzamide 382 0.0013 30.3

2-fluoro-5-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)benzamide 400 0.0006 30.4

2-fluoro-4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)benzamide 400 0.002

TABLE 34B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 30.1 TO 30.4. Unless otherwise stated, all starting materials are commercially available from common vendors. Reaction Ex. # Key starting Material(s)/Source Condition 30.1

KOH, t-BuOH, 80° C. 30.2

KOH, t-BuOH, 80° C. 30.3

EtOH/DMSO NaOH/H₂O₂ 30.4

EtOH/DMSO NaOH/H₂O₂

TABLE 34C 1H NMR δ (PPM) DATA FOR EXAMPLES 30.1 TO 30.4 Ex # Structure ¹H NMR 30.1

(400 MHz, DMSO-d₆) 4.24-4.35 (m, 4 H) 4.37-4.46 (m, 1 H) 6.75 (d, J = 8.80 Hz, 1 H) 7.21 (t, J = 7.34 Hz, 1 H) 7.45-7.59 (m, 3 H) 7.62-7.81 (m, 3 H) 7.99-8.17 (m, 4 H) 8.67 (d, J = 2.35 Hz, 1 H) 8.71 (d, J = 2.35 Hz, 1 H) 30.2

(400 MHz, DMSO-d₆) 4.20-4.35 (m, 4 H) 4.38-4.49 (m, 1 H) 6.75 (d, J = 9.00 Hz, 1 H) 7.16-7.28 (m, 1 H) 7.45-7.59 (m, 3 H) 7.64- 7.74 (m, 3 H) 7.98-8.20 (m, 4 H) 8.66 (d, J = 2.35 Hz, 1 H) 8.71 (d, J = 2.35 Hz, 1 H) 30.3

(400 MHz, chloroform-d) 4.34-4.51 (m, 5 H) 5.94 (br. s., 1 H) 6.64 (d, J = 9.00 Hz, 1 H) 6.77 (d, J = 10.17 Hz, 1 H) 7.19-7.25 (m, 1 H) 7.34 (dd, J = 11.35, 8.61 Hz, 1 H) 7.49-7.56 (m, 1 H) 7.60 (d, J = 7.82 Hz, 1 H) 7.72 (d, J = 8.41 Hz, 1 H) 7.77 (ddd, J = 8.17, 5.14, 2.54 Hz, 1 H) 7.88 (d, J = 8.80 Hz, 1 H) 8.30 (dd, J = 7.43, 2.54 Hz, 1 H) 8.55 (d, J = 2.35 Hz, 1 H) 8.62 (d, J = 2.35 Hz, 1 H). 30.4

(400 MHz, chloroform-d) 4.33-4.52 (m, 5 H) 5.89 (br. s., 1 H) 6.64 (d, J = 9.00 Hz, 1 H) 6.76 (d, J = 11.35 Hz, 1 H) 7.20-7.26 (m, 1 H) 7.36- 7.47 (m, 2 H) 7.54 (t, J = 7.73 Hz, 1 H) 7.61 (d, J = 8.02 Hz, 1 H) 7.73 (d, J = 8.41 Hz, 1 H) 7.89 (d, J = 9.00 Hz, 1 H) 8.30 (t, J = 8.02 Hz, 1 H) 8.58 (d, J = 2.35 Hz, 1 H) 8.65 (d, J = 2.35 Hz, 1 H).

Example 31.1 2-(3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenyl)propan-2-ol

To a mixture of methyl 3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzoate (0.044 g, 0.110 mmol) and THF (1 mL) was added methylmagnesium bromide (0.110 mL, 0.331 mmol). The mixture was stirred at RT for 2 h. LCMS showed the product. The mixture was diluted with saturated NH₄Cl and extracted with EtOAc. The organic layer was dried over Na₂SO₄ and concentrated in vacuo. The crude was purified by silica gel chromatography (12 g, 10%-100% EtOAc-Hexane). The product was obtained as a white solid (44 mg, 100%). ¹H NMR (400 MHz, chloroform-d) δ ppm 1.66 (s, 6H) 1.88 (br. s., 1H) 4.29-4.63 (m, 5H) 6.62 (d, J=8.80 Hz, 1H) 7.22 (t, J=7.43 Hz, 1H) 7.39 (d, J=7.63 Hz, 1H) 7.51 (dt, J=11.79, 7.70 Hz, 2H) 7.57-7.65 (m, 2H) 7.66-7.76 (m, 2H) 7.87 (d, J=8.80 Hz, 1H) 8.54 (d, J=2.35 Hz, 1H) 8.58 (d, J=2.15 Hz, 1H). ESI (M+1) 397; calc for C₂₅H₂₄N₄ 396.

The following Table 35A lists compounds of Examples 31.1 to 31.2, which were made analogous to Scheme 31 by using the appropriate materials and reaction conditions, which are listed in Table 35B. The NMR data of the Examples are listed in Table 35C.

TABLE 35A EXAMPLES 31.1 TO 31.2 ESI-MS Ex. # Structure Chemical Name (M + 1) IC₅₀ (μM) 31.1

2-(3-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin- 2-yl)phenyl)propan-2-ol 397 0.0034 31.2

2-(4-(3-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin- 2-yl)phenyl)propan-2-ol 397 0.0042

TABLE 35B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 31.1 TO 31.2. Unless otherwise stated, all starting materials are commercially available from common vendors. Ex. # Key Starting Material(s)/Source Reaction Condition 31.1

CH₃MgBr, THF, RT 31.2

CH₃MgBr, THF, RT

TABLE 35C 1H NMR δ (PPM) DATA FOR EXAMPLES 31.1 TO 31.2 Ex # Structure NMR 31.1

(400 MHz, chloroform-d) 1.66 (s, 6 H) 1.88 (br. s., 1 H) 4.29-4.63 (m, 5 H) 6.62 (d, J = 8.80 Hz, 1 H) 7.22 (t, J = 7.43 Hz, 1 H) 7.39 (d, J = 7.63 Hz, 1 H) 7.51 (dt, J = 11.79, 7.70 Hz, 2 H) 7.57-7.65 (m, 2 H) 7.66-7.76 (m, 2 H) 7.87 (d, J = 8.80 Hz, 1 H) 8.54 (d, J = 2.35 Hz, 1 H) 8.58 (d, J = 2.15 Hz, 1 H). 31.2

(400 MHz, chloroform-d) 1.65 (s, 6 H) 1.80 (s, 1 H) 4.38-4.53 (m, 5 H) 6.63 (d, J = 8.80 Hz, 1 H) 7.22 (t, J = 7.43 Hz, 1 H) 7.47-7.56 (m, 3 H) 7.60 (d, J = 7.63 Hz, 1 H) 7.65 (d, J = 8.41 Hz, 2 H) 7.72 (d, J = 8.41 Hz, 1 H) 7.87 (d, J = 9.00 Hz, 1 H) 8.53 (d, J = 2.35 Hz, 1 H) 8.57 (d, J = 2.54 Hz, 1 H).

Example 32.1 2-(3-(3-(1,2,3,6-tetrahydropyridin-4-yl)pyrazin-2-yl)azetidin-1-yl)quinoline

A mixture of tert-butyl 4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-5,6-dihydropyridine-1(2H)-carboxylate (0.100 g, 0.225 mmol, SCHEME 5) CH₂Cl₂ (1 mL) and TFA (0.174 mL, 2.255 mmol) was stirred at RT for 1 h. LCMS showed the product and no more starting material was present. The mixture was concentrated in vacuo and neutralized with Na₂CO₃. The mixture was extracted with a mixture of CHCl₃:i-PrOH (3:1) three times. The organic layer was dried over Na₂SO₄ and concentrated in vacuo. The product was obtained as a white solid (77 mg, 99%).

ESI-MS (M+1): 344. PDE10 IC₅₀ (μM): 0.013.

¹H NMR δ (ppm): (400 MHz, chloroform-d) 2.53 (d, J=1.76 Hz, 2H) 3.18 (t, J=5.67 Hz, 2H) 3.61 (d, J=2.74 Hz, 2H) 4.38-4.59 (m, 5H) 5.86 (br. s., 1H) 6.66 (d, J=8.80 Hz, 1H) 7.22 (t, J=7.43 Hz, 1H) 7.49-7.57 (m, 1H) 7.61 (d, J=7.83 Hz, 1H) 7.74 (d, J=8.41 Hz, 1H) 7.89 (d, J=9.00 Hz, 1H) 8.42 (d, J=2.35 Hz, 1H) 8.47 (d, J=2.35 Hz, 1H).

Example 33.1 Lithium 3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzoate

A mixture of methyl 3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzoate (0.079 g, 0.198 mmol, SCHEME 5), lithium hydroxide hydrate (0.017 g, 0.397 mmol), water (0.4 mL) and THF (1.2 mL) was stirred at RT overnight. The mixture was concentrated in vacuo. The product was obtained as an off-white solid (83 mg, 108%).

ESI-MS (M+1): 383. PDE10 IC₅₀ (μM): 0.0016.

¹H NMR δ (ppm): (400 MHz, DMSO-d₆) 4.20-4.45 (m, 5H) 6.76 (d, J=9.00 Hz, 1H) 7.21 (t, J=7.04 Hz, 1H) 7.42-7.61 (m, 4H) 7.70 (d, J=7.82 Hz, 1H) 7.97-8.04 (m, 2H) 8.08 (s, 1H) 8.64 (dd, J=9.39, 2.35 Hz, 2H).

Example 34.1 (1H-benzoimidazol-2-yl)-{3-[3-(2-methoxy-phenoxy)-pyrazin-2-yl]-azetidin-1-yl}-methanone

The mixture of 2-azetidin-3-yl-3-(2-methoxy-phenoxy)-pyrazine hydrochloride (108 mg, 0.37 mmol), HATU (280 mg, 0.74 mmol) and TEA (130 mg, 1.3 mmol) in dry DCM (10 mL) was stirred at RT for 30 min, then 1H-benzoimidazole-2-carboxylic acid was added to the solution. The solution was heated to 80° C. overnight. The mixture was poured into saturated aqueous Na₂CO₃ and extracted with DCM (50 mL×2). The organic layer was washed with brine, dried over Na₂SO₄ and concentrated to give the crude compound, which was purified by ISCO silica gel column (10% to 80% EtOAc in petroleum ether) and followed by reverse phase prep. HPLC (10% to 80% water/MeCN) to give (1H-benzoimidazol-2-yl)-{3-[3-(2-methoxy-phenoxy)-pyrazin-2-yl]-azetidin-1-yl}-methanone (40 mg, 0.11 mmol, yield 27%).

The following Table 36A lists compounds of Examples 34.1 to 34.2, which were made analogous to Scheme 34 by using the appropriate materials and reaction conditions, which are listed in Table 36B. The NMR data of the Examples are listed in Table 36C.

TABLE 36A EXAMPLES 34.1 TO 34.2 ESI-MS IC₅₀ Ex. # Structure Chemical Name (M + 1) (uM) 34.1

(1H-Benzoimidazol-2-yl)-{3-[3- (2-methoxy-phenoxy)-pyrazin-2- yl]-azetidin-1-yl}-methanone 402 1.74 34.2

(1H-Benzoimidazol-2-yl)-{3-[3- (3-methoxy-phenoxy)-pyrazin-2- yl]-azetidin-1-yl}-methanone 402 0.78 34.3

(1H-benzoimidazol-2-yl)-{3-[3- (4-methoxy-phenoxy)-pyrazin-2- yl]-azetidin-1-yl}-methanone 402 2.04 34.4

(1H-Benzoimidazol-2-yl)-[3-(3- phenoxy-pyrazin-2-yl)-azetidin- 1-yl]-methanone 372 0.73 34.5

(1H-benzoimidazol-2-yl)-{3-[3- (tetrahydro-pyran-4-yl)-pyrazin-2- yl]-azetidin-1-yl}-methanone 364 0.124 34.6

(7-Chloro-1H-benzoimidazol-2- yl)-[3-(3-phenyl-pyrazin-2-yl)- azetidin-1-yl]-methanone 390 0.131 34.7

(6-Chloro-1H-benzoimidazol-2- yl)-[3-(3-phenyl-pyrazin-2-yl)- azetidin-1-yl]-methanone 390 0.0692 34.8

(7-Fluoro-1H-benzoimidazol-2- yl)-[3-(3-phenyl-pyrazin-2-yl)- azetidin-1-yl]-methanone 374 0.0438 34.9

(6-Fluoro-1H-benzoimidazol-2- yl)-[3-(3-phenyl-pyrazin-2-yl)- azetidin-1-yl]-methanone 374 0.0373 34.10

(6-methyl-1H-benzoimidazol-2- yl)-[3-(3-phenyl-pyrazin-2-yl)- azetidin-1-yl]-methanone 370 0.0687 34.11

(6-methyl-1H-benzoimidazol-2- yl)-[3-(3-phenyl-pyrazin-2-yl)- azetidin-1-yl]-methanone 370 0.0219 34.12

(1H-benzoimidazol-2-yl)-{3-[3-(2- methoxy-phenyl)-pyrazin-2-yl]- azetidin-1-yl}-methanone 386 0.0978 34.13

(1H-benzoimidazol-2-yl)-{3-[3-(3- methoxy-phenyl)-pyrazin-2-yl]- azetidin-1-yl}-methanone 386 0.087 34.14

(1H-Benzoimidazol-2-yl)-{3-[3- (4-methoxy-phenyl)-pyrazin-2-yl]- azetidin-1-yl}-methanone 386 0.0322 34.14

(1H-benzoimidazol-2-yl)-[3-(2- phenyl-pyridin-3-yl)-azetidin-1- yl]-methanone 355 0.515

TABLE 36B STARTING MATERIALS AND REACTION CONDITION FOR PREPARATION OF EXAMPLES 34.1 TO 34.2. Unless otherwise stated, all starting materials are commercially available from common vendors. Ex. # Starting Material 1 Starting Material 2 Reaction Condition 34.1

HATU, TEA, DCM, 80° C. 34.2

HATU, TEA, DCM, 80° C. 34.3

HATU, TEA, DCM, 80° C. 34.4

HATU, TEA, DCM, 80° C. 34.5

HATU, TEA, THF 34.6

HATU, TEA, DCM, 0° C. to RT 34.7

HATU, TEA, DCM, 0° C. to RT 34.8

HATU, TEA, DCM, 0° C. to RT 34.9

HATU, TEA, DCM, 0° C. to RT 34.10

HATU, TEA, DCM, 0° C. to RT 34.11

HATU, TEA, DCM, 0° C. to RT 34.12

HATU, TEA, DCM, RT 34.13

HATU, TEA, DCM, RT 34.14

HATU, TEA, DCM, RT 34.14

HATU, TEA, DCM, RT

TABLE 36C 1H NMR δ (PPM) DATA FOR EXAMPLES 34.1 TO 34.22 Ex # Structure NMR 34.1 

(CD₃OD, 400 MHz): 8.19 (d, J = 2.4 Hz, 1H); 7.93 (d, J = 2.8 Hz, 1H); 7.74-7.70 (m, 2H); 7.37- 7.33 (m, 2H); 7.26-7.15 (m, 1H); 7.02-6.97 (m, 3H); 5.38- 5.29 (m, 2H); 4.85-4.71 (m, 2H); 4.53-4.10 (m, 1H); 3.69 (s, 3H). 34.2 

(CD₃OD, 400 MHz): 8.18 (d, J = 2.4 Hz, 1H); 7.95 (d, J = 2.8 Hz, 1H); 7.70- 7.68 (m, 2H); 7.35-7.33 (m, 2H); 7.28-7.24 (m, 1H); 6.76- 6.73 (m, 1H); 6.66-6.64 (m, 2H); 5.32-5.27 (m, 1H); 5.21- 5.17 (m, 1H); 4.36-4.63 (m, 2H); 4.49-4.43 (m, 1H); 3.74 (s, 3H). 34.3 

(CD₃OD, 400 MHz): 8.27-8.26 (m, 1H); 7.99- 7.98 (m, 1H); 7.85-7.83 (m, 2H); 7.67-7.64 (m, 2H); 7.08- 7.06 (m, 2H); 6.96-6.94 (m, 2H); 5.15-5.13 (m, 2H); 4.76- 7.74 (m, 2H); 4.56-4.53 (m, 1H); 3.79 (s, 3H). 34.4 

(CD₃OD, 400 MHz): 8.29 (d, J = 2.8 Hz, 1H); 8.00-7.99 (m, 1H); 7.75-7.73 (m, 2H); 7.49- 7.47 (m, 2H); 7.43-7.39 (m, 2H); 7.25-7.23 (m, 1H); 7.17- 7.14 (m, 2H); 5.22-5.13 (m, 2H); 4.73-4.68 (m, 2H); 4.58- 4.51 (m, 1H) 34.5 

(CD₃OD, 400 MHz): 8.48-8.45 (m, 2H); 7.74- 7.72 (m, 2H); 7.47-7.44 (m, 2H); 5.15-5.12 (m, 1H); 5.03- 5.01 (m, 1H); 4.64-4.56 (m, 3H); 4.09-4.02 (m, 2H); 3.65- 3.59 (m, 2H); 3.17-3.13 (m, 1H); 2.05-2.03 (m, 2H); 1.66- 1.63 (m, 2H) 34.6 

(CDCl₃, 400 MHz) 8.62-8.58 (m, 2H); 7.54- 7.49 (m, 6H); 7.31-7.20 (m, 2H); 5.16 (br, 2H); 4.63- 4.59 (m, 1H); 4.50-4.46 (m, 1H); 4.40-4.33 (m, 1H). 34.7 

(CDCl₃, 400 MHz): 8.55- 8.51 (m, 2H); 7.47-7.41 (m, 7H); 7.24 (s, 1H); 5.06 (m, 2H); 4.53- 4.50 (m, 1H); 4.42-4.37 (m, 1H); 4.30- 4.28 (m, 1H). 34.8 

(CDCl₃, 400 MHz): 8.68- 8.59 (m, 2H); 7.62-7.49 (m, 5H); 7.45-7.41 (m, 1H); 7.38-7.20 (m, 1H); 7.05-6.96 (m, 1H); 5.25- 5.14 (m, 2H); 4.64-4.60 (m, 1H); 4.52-4.49 (m, 1H); 4.47- 4.33 (m, 1H). 34.9 

(MeOD, 400 MHz): 8.62- 8.61 (m, 1H); 8.55-8.54 (m, 1H); 7.68-7.52 (m, 6H); 7.35- 7.31 (m, 1H); 7.11-7.08 (m, 1H); 5.06- 5.00 (m, 2H); 4.46-4.36 (m, 3H). 34.10

(CDCl₃, 400 MHz): 8.64- 8.63 (m, 1H); 8.61-8.60 (m, 1H); 7.56-7.52 (m, 4H); 7.47- 7.45 (m, 2H); 7.28-7.26 (m, 1H); 7.17-7.15 (m, 1H); 5.17- 5.10 (m, 2H); 4.56-4.54 (m, 1H); 4.41-4.36 (m, 2H); 2.59 (s, 3H). 34.11

(CDCl₃, 400 MHz): 8.54- 8.53 (m, 1H); 8.51-8.50 (m, 1H); 7.45-7.43 (m, 6H); 7.18 (brs, 1H); 7.06-7.04 (m, 1H); 5.10- 5.06 (m, 2H); 4.55-4.53 (m, 1H); 4.43- 4.38 (m, 1H); 4.29-4.27 (m, 1H); 2.14 (s, 3H). 34.12

(CDCl₃, 400 MHz): 8.69- 8.68 (m, 1H); 8.56-8.55 (m, 1H); 7.74-7.72 (m, 2H); 7.53-7.45 (m, 3H); 7.36-7.34 (m, 1H); 7.17- 7.12(m, 2H); 5.01-4.95 (m, 2H); 4.50-4.91 (m, 2H); 4.15- 4.09 (m, 1H); 3.81 (s, 3H). 34.13

(CDCl₃, 400 MHz): 8.62- 8.57 (m, 2H); 7.69-7.67 (m, 2H); 7.46-7.42 (m, 1H); 7.34- 7.32 (m, 2H); 7.06-7.01 (m, 3H); 5.19-5.15 (m, 2H); 4.68- 4.31 (m, 3H); 3.88 (s, 3H). 34.14

(CDCl₃, 400 MHz): 8.86 (d, J = 2.8 Hz, 2H); 7.73-7.71 (m, 2H); 7.45- 7.43 (m, 2H); 7.40-7.37 (m, 2H); 7.07-7.05 (m, 2H); 5.24- 5.22 (m, 1H); 5.13-5.12 (m, 1H); 4.59-4.57 (m, 1H); 4.48- 4.40 (m, 2H); 3.89 (s, 3H). 34.14

(CDCl₃, 400 MHz): 8.87- 8.86 (m, 1H); 8.58-8.56 (m, 1H); 7.86-7.81 (m, 1H); 7.70- 7.68 (m, 2H); 7.58-7.56 (m, 3H); 7.45-7.38 (m, 4H); 5.17- 5.15 (m, 1H); 4.98-4.96 (m, 1H); 4.51-4.47 (m, 1H); 4.28- 4.15 (m, 2H).

Example 35.1 2-(3-(3-(1H-indol-5-yl)pyrazin-2-yl)azetidin-1-yl)quinazoline

The above example was run in four different flasks under four different sets of reaction conditions. All four flasks were then combined before work up and purified to give the product.

Reaction condition (1): 2M aqueous sodium carbonate (0.252 mL, 0.504 mmol, J. T. Baker) was added to a stirred mixture of 2-(3-(3-chloropyrazin-2-yl)azetidin-1-yl)quinazoline (0.050 g, 0.168 mmol, Preparation 1), indole-5-boronic acid (0.032 g, 0.202 mmol, Frontier Scientific), and trans-dichlorobis(triphenylphosphine)palladium (ii) (0.006 mg, 0.008 mmol, Strem) in 1,4-dioxane (0.7 mL) in a sealed tube under an argon atmosphere. The reaction mixture was stirred at 80° C. for 17 h before being cooled to RT and combined with the other three crude reactions.

Reaction condition (2) 2M aqueous sodium carbonate (0.252 mL, 0.504 mmol, J. T. Baker) was added to a stirred mixture of 2-(3-(3-chloropyrazin-2-yl)azetidin-1-yl)quinazoline (0.050 g, 0.168 mmol, Preparation 1), indole-5-boronic acid (0.032 g, 0.202 mmol, Frontier), and tetrakis(triphenylphosphine)palladium (0.010 g, 0.008 mmol, Strem) in 1,4-dioxane (0.7 mL) in a sealed tube under an argon atmosphere. The reaction mixture was stirred at 80° C. for 17 h before being cooled to RT and combined with the other three crude reactions.

Reaction condition (3) 2-(3-(3-Chloropyrazin-2-yl)azetidin-1-yl)quinazoline (0.050 g, 0.168 mmol, Preparation 1), indole-5-boronic acid (0.032 g, 0.202 mmol, Frontier Scientific), dichloro 1,1′-bis(diphenylphosphino) ferrocene palladium (ii) (0.007 g, 0.008 mmol, Strem), and potassium phosphate (0.035 mL, 0.420 mmol, Aldrich) were mixed in 1,4-dioxane (1.5 mL) and water (0.3 mL) in a sealed tube under an argon atmosphere. The reaction mixture was stirred at 80° C. for 17 h before being cooled to RT and combined with the other three crude reactions

Reaction condition (4) 2-(3-(3-Chloropyrazin-2-yl)azetidin-1-yl)quinazoline (0.050 g, 0.168 mmol, Preparation 1), indole-5-boronic acid (0.032 g, 0.202 mmol, Frontier Scientific), bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium (ii) (0.006 g, 0.008 mmol, Strem), and potassium phosphate (0.089 g, 0.420 mmol, Aldrich) were mixed in 1,4-dioxane (0.8 mL) and water (0.2 mL) in a sealed tube under an argon atmosphere. The reaction mixture was stirred at 80° C. for 17 h before being cooled to RT and combined with the other three crude reactions.

The combined reaction mixtures were diluted with water and extracted with DCM (1×). The organic extract was dried over magnesium sulfate, filtered, and concentrated in vacuo. The resulting crude material was purified via silica gel flash column chromatography eluting with 0% to 100% EtOAc in hexanes to give 0.217 g (85%) of a yellow amorphous solid.

ESI-MS (M+1): 379.1. PDE10 IC₅₀ (μM): 0.009.

¹H NMR δ (ppm): (400 MHz, d-chloroform) 4.44-4.60 (m, 5H) 6.63 (s, 1H) 7.22 (t, J=7.20 Hz, 1H) 7.30 (d, J=2.00 Hz, 1H) 7.35 (d, J=8.41 Hz, 1H) 7.50 (d, J=8.41 Hz, 1H) 7.59-7.70 (m, 3H) 7.77 (s, 1H) 8.47-8.57 (m, 3H) 9.01 (s, 1H).

The following Table 37 lists compounds of Examples 36.1 to 36.190, which can be made according to the above schemes and preparations.

TABLE 37 Examples 36.1 to 36.190 Ex. # Structure Chemical Name 36.1

2-(3-(5-(2-methoxypyridin-3- yl)pyrimidin-4-yl)azetidin-1- yl)quinazoline 36.2

2-(3-(6-(2-methoxypyridin-3- yl)-1H-imidazo[4,5-b]pyrazin- 5-yl)azetidin-1-yl)quinazoline 36.3

2-(2-methoxypyridin-3-yl)-3-(1- (quinazolin-2-yl)azetidin-3- yl)pyrido[2,3-b]pyrazine 36.4

3-(2-methoxypyridin-3-yl)-2-(1- (quinazolin-2-yl)azetidin-3- yl)pyrido[2,3-b]pyrazine 36.5

2-(3-(3-(2-methoxypyridin-3- yl)quinoxalin-2-yl)azetidin-1- yl)quinazoline 36.6

methyl 3-(3-(3-hydroxy-1-(quinazolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)benzoate 36.7

methyl 3-(3-(3-hydroxy-1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)benzoate 36.8

3-(3-(4-(methylsulfonyl)piperidin-1- yl)pyrazin-2-yl)-1-(quinazolin-2- yl)azetidin-3-ol 36.9

3-(3-(4-(hydroxymethyl)piperidin-1- yl)pyrazin-2-yl)-1-(quinolin-2- yl)azetidin-3-ol 36.10

1-(3-(3-hydroxy-1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.11

3-(3-(4-(methylsulfonyl)piperidin-1- yl)pyrazin-2-yl)-1-(quinolin-2- yl)azetidin-3-ol 36.12

methyl 3-(3-(3-fluoro-1-(quinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)benzoate 36.13

methyl 3-(3-(3-fluoro-1-(quinazolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)benzoate 36.14

2-(3-fluoro-3-(3-(4- (methylsulfonyl)piperidin-1-yl)pyrazin- 2-yl)azetidin-1-yl)quinoline 36.15

(1-(3-(3-fluoro-1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidin-4-yl)methanol 36.16

1-(3-(3-fluoro-1-(quinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.17

2-(3-fluoro-3-(3-(4- (methylsulfonyl)piperidin-1- yl)pyrazin-2-yl)azetidin-1- yl)quinazoline 36.18

3-(3-(4-(hydroxymethyl)piperidin- 1-yl)pyrazin-2-yl)-1-(quinazolin- 2-yl)azetidin-3-ol 36.19

1-(3-(1-hydroxy-3-(quinazolin-2- yl)cyclobutyl)pyrazin-2- yl)piperidine-4-carbonitrile 36.20

2-(3-(6-(3- methoxyphenyl)pyrazolo[1,5-a]pyridin- 7-yl)azetidin-1-yl)quinoline 36.21

2-(3-(7-(3- methoxyphenyl)imidazo[1,5-a]pyridin- 8-yl)azetidin-1-yl)quinoline 36.22

2-(3-(6-(3- methoxyphenyl)pyrazolo[1,5-a]pyrazin- 7-yl)azetidin-1-yl)quinoline 36.23

2-(3-(6-(1H-imidazol-4-yl)-3-(3- methoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 36.24

2-(3-(3-(3- methoxyphenyl)pyrrolo[1,2-a]pyrazin- 4-yl)azetidin-1-yl)quinoline 36.25

2-(3-(6-(3- methoxyphenyl)imidazo[1,2-a]pyrazin- 5-yl)azetidin-1-yl)quinoline 36.26

2-(3-(6-(3- methoxyphenyl)imidazo[1,5-a]pyrazin- 5-yl)azetidin-1-yl)quinoline 36.27

2-(3-(3-(3-methoxyphenyl)-6- (oxetan-3-yl)pyrazin-2-yl)azetidin- 1-yl)quinoline 36.28

2-(3-(6-(azetidin-3-yl)-3-(3- methoxyphenyl)pyrazin-2- yl)azetidin-1-yl)quinoline 36.29

4-(5-(3-methoxyphenyl)-6-(1- (quinolin-2-yl)azetidin-3-yl)pyrazin- 2-yl)oxazole 36.30

3-(5-(3-methoxyphenyl)-6-(1- (quinolin-2-yl)azetidin-3-yl)pyrazin- 2-yl)-1,2,4-oxadiazole 36.31

1,1,1-trifluoro-2-(5-(3- methoxyphenyl)-6-(1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)propan- 2-ol 36.32

N-((5-(3-methoxyphenyl)-6-(1- (quinazolin-2-yl)azetidin-3- yl)pyrazin-2-yl)methyl)acetamide 36.33

2-(3-(3-(3-methoxyphenyl)-6- (tetrahydrofuran-2-yl)pyrazin-2- yl)azetidin-1-yl)quinazoline 36.34

2-(3-(3-(3-methoxyphenyl)-6- (oxetan-2-yl)pyrazin-2-yl)azetidin- 1-yl)quinazoline 36.35

6-(3-methoxyphenyl)-5-(1-(quinolin- 2-yl)azetidin-3-yl)pyrazine-2- carbonitrile 36.36

2-(3-methoxyphenyl)-3-(1-(quinolin- 2-yl)azetidin-3-yl)-6,7-dihydro-5H- cyclopenta[b]pyrazin-5-one 36.37

3-(3-methoxyphenyl)-2-(1- (quinazolin-2-yl)azetidin-3-yl)-6,7- dihydro-5H-cyclopenta[b]pyrazin-5- one 36.38

2-(3-methoxyphenyl)-3-(1- (quinazolin-2-yl)azetidin-3-yl)-5H- pyrrolo[2,3-b]pyrazin-6(7H)-one 36.39

1-(6-(3-methoxyphenyl)-5-(1- (quinazolin-2-yl)azetidin-3- yl)pyrazin-2-yl)ethanol 36.40

(6-(3-methoxyphenyl)-5-(1- (quinazolin-2-yl)azetidin-3- yl)pyrazin-2-yl)methanol 36.41

5-(3-methoxyphenyl)-6-(1-(quinolin- 2-yl)azetidin-3-yl)pyrazine-2- carboxamide 36.42

5-(3-methoxyphenyl)-6-(1-(quinolin- 2-yl)azetidin-3-yl)pyrazine-2- carbonitrile 36.43

1-(5-(3-methoxyphenyl)-6-(1- (quinolin-2-yl)azetidin-3-yl)pyrazin- 2-yl)ethanone 36.44

1-(5-(3-methoxyphenyl)-6-(1- (quinolin-2-yl)azetidin-3-yl)pyrazin- 2-yl)ethanol 36.45

2-(5-(3-methoxyphenyl)-6-(1- (quinolin-2-yl)azetidin-3-yl)pyrazin- 2-yl)propan-2-ol 36.46

(5-(3-methoxyphenyl)-6-(1- (quinazolin-2-yl)azetidin-3-yl) pyrazin-2-yl)methanol 36.47

1-(6-(3-methoxyphenyl)-5-(1- (quinazolin-2-yl)azetidin-3- yl)pyrazin-2-yl)ethanone 36.48

(S)-1-(3-(3-(1-(6-chloroquinazolin-2- yl)azetidin-3-yl)pyrazin-2-yl)-3- (trifluoromethyl)pyrrolidin-1- yl)ethanone 36.49

(S)-1-(3-(3-(1-(6-chloroquinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)- 3-(trifluoromethyl)pyrrolidin-1- yl)ethanone 36.50

(S)-1-(3-(3-(1-(6-fluoroquinazolin-2- yl)azetidin-3-yl)pyrazin-2-yl)-3- (trifluoromethyl)pyrrolidin-1- yl)ethanone 36.51

(S)-1-(3-(3-(1-(6-fluoroquinolin-2- yl)azetidin-3-yl)pyrazin- 2-yl)-3-(trifluoromethyl)pyrrolidin- 1-yl)ethanone 36.52

(R)-1-(3-(3-(1-(6-chloroquinazolin-2- yl)azetidin-3-yl)pyrazin-2-yl)-3- (trifluoromethyl)pyrrolidin-1- yl)ethanone 36.53

(R)-1-(3-(3-(1-(6-chloroquinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)-3- (trifluoromethyl)pyrrolidin-1- yl)ethanone 36.54

(R)-1-(3-(3-(1-(6-fluoroquinazolin-2- yl)azetidin-3-yl)pyrazin-2-yl)-3- (trifluoromethyl)pyrrolidin-1- yl)ethanone 36.55

(R)-1-(3-(3-(1-(6-fluoroquinolin-2- yl)azetidin-3-yl)pyrazin-2-yl)-3- (trifluoromethyl)pyrrolidin-1- yl)ethanone 36.56

6-(3-(3-(4-cyanopiperidin-1- yl)pyrazin-2-yl)azetidin-1-yl)-N- phenylnicotinamide 36.57

1-(3-(1-(4-methylquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.58

1-(3-(1-(4-chloroquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.59

1-(3-(1-(6-methoxy-4- methylquinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.60

1-(3-(1-(4-methoxyquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.61

1-(3-(1-(3-methylquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.62

1-(3-(1-(4,7-dimethylquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.63

1-(3-(1-(8-hydroxyquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.64

1-(3-(1-(3-chloroquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.65

1-(3-(1-(6-methylquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.66

1-(3-(1-(7-methoxy-4- methylquinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.67

1-(3-(1-(4,8-dimethylquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.68

1-(3-(1-(5-(trifluoromethyl)quinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.69

1-(3-(1-(6-methoxyquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.70

1-(3-(1-(7-chloroquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.71

1-(3-(1-(5-chloroquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.72

1-(3-(1-(8-chloroquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.73

1-(3-(1-(6-chloro-4-methylquinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.74

1-(3-(1-(5-methyl-1,6-naphthyridin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.75

1-(3-(1-(8-methyl-4- (trifluoromethyl)quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.76

1-(3-(1-(7-chloro-4-methylquinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.77

2-(3-(3-(4-cyanopiperidin-1- yl)pyrazin-2-yl)azetidin-1- yl)quinoline-4-carbonitrile 36.78

1-(3-(1-(3-methyl-6- (trifluoromethyl)quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.79

1-(3-(1-(3,7-dimethylquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.80

1-(3-(1-(4-chloro-6-methylquinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.81

1-(3-(1-(4-methyl-7,8-dihydro-6H- cyclopenta[g]quinolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.82

1-(3-(1-(8-methoxyquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.83

1-(3-(1-(6-fluoro-4-methylquinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.84

1-(3-(1-(4-chloro-6- methoxyquinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.85

1-(3-(1-(4-(trifluoromethyl)quinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.86

1-(3-(1-(6-chloroquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.87

1-(3-(1-(6-chloro-1,5-naphthyridin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.88

1-(3-(1-(6-bromoquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.89

1-(3-(1-(7-fluoro-4-methylquinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.90

1-(3-(1-(6,7-dimethoxyquinazolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.91

1-(3-(1-(4-fluoroquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.92

1-(3-(1-(7-bromoquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.93

1-(3-(1-(6,8-dimethyl-1,5- naphthyridin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.94

1-(3-(1-(3-methyl-8- (trifluoromethyl)quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.95

1-(3-(1-(3-methyl-6- (trifluoromethoxy)quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.96

1-(3-(1-(3-methyl-8- (trifluoromethoxy)quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.97

1-(3-(1-(6-chloro-3-methylquinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.98

1-(3-(1-(6-fluoroquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.99

1-(3-(1-(6-(trifluoromethyl)quinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.100

2-(3-(3-(4-cyanopiperidin-1- yl)pyrazin-2-yl)azetidin-1- yl)quinoline-6-carbonitrile 36.101

1-(3-(1-(6-bromoquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.102

1-(3-(1-(7-fluoroquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.103

1-(3-(1-(4-chloro-6-fluoroquinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.104

1-(3-(1-(pyrido[4,3-d]pyrimidin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.105

1-(3-(1-(8-methoxyquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.106

1-(3-(1-(7-methoxyquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.107

1-(3-(1-(4-chloro-6- (trifluoromethyl)quinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.108

1-(3-(1-(4-chloro-7- (trifluoromethyl)quinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.109

1-(3-(1-(4-chloro-6- methoxyquinazolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.110

1-(3-(1-(4-chloro-7- methoxyquinazolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.111

1-(3-(1-(4-chloro-8- methoxyquinazolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.112

1-(3-(1-(4-chloro-5- fluoroquinazolin-2-yl)azetidin- 3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.113

1-(3-(1-(4-chloro-6- fluoroquinazolin-2-yl)azetidin- 3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.114

1-(3-(1-(4-chloro-7- fluoroquinazolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.115

1-(3-(1-(4-chloro-8- fluoroquinazolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.116

1-(3-(1-(4,7-dichloroquinazolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.117

1-(3-(1-(4-methylquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.118

1-(3-(1-(6-fluoro-4- methoxyquinolin-2-yl)azetidin- 3-yl)pyrazin-2-yl)piperidine- 4-carbonitrile 36.119

1-(3-(1-(6-chloro-4- methoxyquinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.120

1-(3-(1-(4,6-dimethoxyquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.121

1-(3-(1-(4,6-dimethoxyquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.122

1-(3-(1-(4-methyl-6- (trifluoromethoxy)quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.123

1-(3-(1-(5-fluoroquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.124

1-(3-(1-(8-chloro-[1,3]dioxolo[4,5- g]quinazolin-6-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.125

1-(3-(1-(7-chloro-6-methylquinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.126

1-(3-(1-(7-bromoquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.127

1-(3-(1-(5-bromoquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.128

1-(3-(1-(6-chloro-1,7- naphthyridin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.129

1-(3-(1-(1,6-naphthyridin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.130

1-(3-(1-(4-chloropyrido[3,2- d]pyrimidin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.131

1-(3-(1-(1,7-naphthyridin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.132

1-(3-(1-(6-fluoroquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.133

1-(3-(1-(7-fluoroquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.134

1-(3-(1-(6-methoxy-1,7- naphthyridin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.135

1-(3-(1-(7-(trifluoromethyl)quinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.136

1-(3-(1-(pyrido[3,2-d]pyrimidin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.137

1-(3-(1-(6-chloropyrido[3,2- d]pyrimidin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.138

1-(3-(1-(1,5-naphthyridin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.139

1-(3-(1-(7-methoxyquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.140

1-(3-(1-(3-bromo-5-methyl-1,6- naphthyridin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.141

1-(3-(1-(6-bromopyrido[3,2- d]pyrimidin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.142

1-(3-(1-(2-bromopyrido[3,2- d]pyrimidin-6-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.143

1-(3-(1-(7-chloroquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.144

1-(3-(1-(6-chloroquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.145

1-(3-(1-(6-methylquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.146

1-(3-(1-(8-methylquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.147

1-(3-(1-(8-fluoroquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.148

1-(3-(1-(pyrido[3,4-d]pyrimidin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.149

1-(3-(1-(6-bromo-7- methoxyquinazolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.150

1-(3-(1-(7-bromopyrido[3,2- d]pyrimidin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.151

1-(3-(1-(5-methoxyquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.152

1-(3-(1-(6-methoxyquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.153

1-(3-(1-(5-chloroquinazolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.154

1-(3-(1-(5,7-dimethyl-6- nitroquinolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.155

1-(3-(1-(6-(cyclopentyloxy)-7- methoxyquinazolin-2-yl)azetidin-3- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.156

1-(3-(1-(6,7-dimethoxyquinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.157

1-(3-(1-(4,6-dichlorobenzo[d]thiazol- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.158

1-(3-(1- ([1,3]dioxolo[4′,5′:4,5]benzo[1,2- d]thiazol-6-yl)azetidin-3-yl)pyrazin- 2-yl)piperidine-4-carbonitrile 36.159

1-(3-(1-(4,6-difluorobenzo[d]thiazol- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.160

(1-(3-(3-methyl-1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidin-4-yl)methanol 36.161

(1-(3-(3-(hydroxymethyl)-1- (quinolin-2-yl)azetidin-3-yl)pyrazin- 2-yl)piperidin-4-yl)methanol 36.162

(1-(3-(3-chloro-1-(quinolin-2- yl)azetidin-3-yl)pyrazin-2- yl)piperidin-4-yl)methanol 36.163

3-(3-(4-(hydroxymethyl)piperidin-1- yl)pyrazin-2-yl)-1-(quinolin-2- yl)azetidine-3-carbonitrile 36.164

(1-(4-(1-(quinolin-2-yl)azetidin-3- yl)pyrimidin-5-yl)piperidin-4- yl)methanol 36.165

(1-(5-(1-(quinolin-2-yl)azetidin-3- yl)pyrimidin-4-yl)piperidin-4- yl)methanol 36.166

(1-(4-(1-(quinolin-2-yl)azetidin-3- yl)pyridin-3-yl)piperidin-4- yl)methanol 36.167

(1-(5-(1-(quinolin-2-yl)azetidin-3- yl)pyridazin-4-yl)piperidin-4- yl)methanol 36.168

(1-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyridin-2-yl)piperidin-4- yl)methanol 36.169

(1-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyridazin-4-yl)piperidin-4- yl)methanol 36.170

(1-(3-(1-(quinolin-2-yl)azetidin-3- yl)pyridin-4-yl)piperidin-4- yl)methanol 36.171

(1-(3-(1-(7-chloro-8-fluoroquinolin- 2-yl)azetidin-3-yl)pyrazin-2- yl)piperidin-4-yl)methanol 36.172

7-chloro-8-fluoro-2-(3-(3-(2- methoxypyridin-3-yl)pyrazin-2- yl)azetidin-1-yl)quinoline 36.173

7-chloro-2-(4-(3-(4-fluoro-3- methoxyphenyl)pyrazin-2-yl)-5,6- dihydropyridin-1(2H)-yl)quinoline 36.174

1-(7-chloroquinolin-2-yl)-4-(3-(4- fluoro-3-methoxyphenyl)pyrazin-2- yl)piperidin-2-one 36.175

1-(7-chloroquinolin-2-yl)-4-(3-(3,6- dihydro-2H-pyran-4-yl)pyrazin-2- yl)piperidin-2-one 36.176

7-chloro-2-(4-(3-(3,6-dihydro-2H- pyran-4-yl)pyrazin-2-yl)-5,6- dihydropyridin-1(2H)-yl)quinoline 36.177

1-(3-(1-(7-chloroquinolin-2-yl)- 1,2,3,6-tetrahydropyridin-4- yl)pyrazin-2-yl)piperidine-4- carbonitrile 36.178

1-(3-(1-(7-chloroquinolin-2-yl)-2- oxopiperidin-4-yl)pyrazin-2- yl)piperidine-4-carbonitrile 36.179

1-(3-(1-(7-chloro-6-fluoroquinazolin- 2-yl)-1,2,3,6-tetrahydropyridin-4- yl)pyrazin-2-yl)piperidin-4-ol 36.180

1-(7-chloro-6-fluoroquinazolin-2-yl)- 4-(3-(4-hydroxypiperidin-1- yl)pyrazin-2-yl)piperidin-2-one 36.181

3-(3-(1-(7-chloro-6-fluoroquinazolin- 2-yl)-1,2,3,6-tetrahydropyridin-4- yl)pyrazin-2-yl)benzamide 36.182

3-(3-(1-(7-chloro-6-fluoroquinazolin- 2-yl)-2-oxopiperidin-4-yl)pyrazin-2- yl)benzamide 36.183

4-(3-(1-acetyl-1,2,3,6- tetrahydropyridin-4-yl)pyrazin-2-yl)- 1-(7-chloro-6-fluoroquinazolin-2- yl)piperidin-2-one 36.184

1-(4-(3-(1-(7-chloro-6- fluoroquinazolin-2-yl)-1,2,3,6- tetrahydropyridin-4-yl)pyrazin-2-yl)- 5,6-dihydropyridin-1(2H)- yl)ethanone 36.185

2-(4-(3-(5,6-dihydro-2H-pyran-3- yl)pyrazin-2-yl)-5,6-dihydropyridin- 1(2H)-yl)-7-fluoroquinoxaline 36.186

4-(3-(5,6-dihydro-2H-pyran-3- yl)pyrazin-2-yl)-1-(7- fluoroquinoxalin-2-yl)piperidin- 2-one 36.187

N-(3-(3-(1-(7-fluoroquinoxalin-2- yl)-2-oxopiperidin-4-yl)pyrazin-2- yl)phenyl)acetamide 36.188

N-(3-(3-(1-(7-fluoroquinoxalin-2- yl)-1,2,3,6-tetrahydropyridin-4- yl)pyrazin-2-yl)phenyl)acetamide 36.189

(1-(3-(1-(7-fluoroquinoxalin-2-yl)- 1,2,3,6-tetrahydropyridin-4- yl)pyrazin-2-yl)piperidin-4- yl)methanol 36.190

1-(7-fluoroquinoxalin-2-yl)-4-(3-(4- (hydroxymethyl)piperidin-1- yl)pyrazin-2-yl)piperidin-2-one

BIOLOGICAL EXAMPLES

The above PDE10 IC₅₀ data were obtained by using the following assays.

Example A MPDE10A7 Enzyme Activity and Inhibition

Enzyme Activity. An IMAP TR-FRET assay was used to analyze the enzyme activity (Molecular Devices Corp., Sunnyvale Calif.). 5 μL of serial diluted PDE10A (BPS Bioscience, San Diego, Calif.) or tissue homogenate was incubated with equal volumes of diluted fluorescein labeled cAMP or cGMP for 60 min in 384-well polystyrene assay plates (Corning, Corning, N.Y.) at room temperature. After incubation, the reaction was stopped by adding 60 μL of diluted binding reagents and was incubated for 3 hours to overnight at room temperature. The plates were read on an Envision (Perkin Elmer, Waltham, Mass.) for time resolved fluorescence resonance energy transfer. The data were analyzed with GraphPad Prism (La Jolla, Calif.).

Enzyme Inhibition. To check the inhibition profile, 5 μL of serial diluted compounds were incubated with 5 μL of diluted PDE10 enzyme (BPS Bioscience, San Diego, Calif.) or tissue homogenate in a 384-well polystyrene assay plate (Corning, Corning, N.Y.) for 30 min at room temperature. After incubation, 10 μL of diluted fluorescein labeled cAMP or cGMP substrate were added and incubated for 60 min at room temperature. The reaction was stopped by adding 60 μL of diluted binding reagents and plates were read on an Envision (Perkin Elmer, Waltham, Mass.) for time resolved fluorescence resonance energy transfer. The data were analyzed with GraphPad Prism (La Jolla, Calif.).

Example B Apomorphine Induced Deficits in Prepulse Inhibition of the Startle Response in Rats, an In Vivo Test for Antipsychotic Activity

The thought disorders that are characteristic of schizophrenia may result from an inability to filter, or gate, sensorimotor information. The ability to gate sensorimotor information can be tested in many animals as well as in humans. A test that is commonly used is the reversal of apomorphine-induced deficits in the prepulse inhibition of the startle response. The startle response is a reflex to a sudden intense stimulus such as a burst of noise. In this example, rats can be exposed to a sudden burst of noise, at a level of 120 db for 40 msec, e.g., the reflex activity of the rats can be measured. The reflex of the rats to the burst of noise may be attenuated by preceding the startle stimulus with a stimulus of lower intensity, at 3 db to 12 db above background (65 db), which attenuates the startle reflex by 20% to 80%.

The prepulse inhibition of the startle reflex, described above, may be attenuated by drugs that affect receptor signaling pathways in the CNS. One commonly used drug is the dopamine receptor agonist apomorphine. Administration of apomorphine reduces the inhibition of the startle reflex produced by the prepulse. Antipsychotic drugs such as haloperidol prevents apomorphine from reducing the prepulse inhibition of the startle reflex. This assay can be used to test the antipsychotic efficacy of PDE10 inhibitors, as they reduce the apomorphine-induced deficit in the prepulse inhibition of startle.

Example C Conditioned Avoidance Responding (CAR) in Rats, an In Vivo Test for Antipsychotic Activity

Conditioned avoidance responding (CAR) occurs, for instance, when an animal learns that a tone and light predict the onset of a mild foot shock. The subject learns that when the tone and light are on, it must leave the chamber and enter a safe area. All known antipsychotic drugs reduce this avoidance response at doses which do not cause sedation. Examining the ability of test compounds to suppress the conditioned avoidance has been widely used for close to fifty years to screen for drugs with useful antipsychotic properties.

In this example, an animal can be placed in a two-chambered shuttle box and presented with a neutral conditioned stimulus (CS) consisting of a light and tone, followed by an aversive unconditioned stimulus (US) consisting of a mild foot shock through a floor grid in the shuttle box chamber. The animal can be free to escape the US by running from one chamber to the other, where the grid is not electrified. After several presentations of the CS-US pair, the animal typically learns to leave the chamber during the presentation of the CS and avoid the US altogether. Animals treated with clinically-relevant doses of antipsychotic drugs have a suppression of their rate of avoidances in the presence of the CS even though their escape response to the shock itself is unaffected.

Specifically, conditioned avoidance training can be conducted using a shuttle box (Med Associates, St. Albans, Vt.). The shuttle box is typically divided into 2 equal compartments that each contain a light source, a speaker that emits an 85 dB tone when activated and an electrified grid that can deliver a scrambled foot shock. Sessions can consist of 20 trials per day (intertrial interval of 25-40 sec) during which a 10 sec illumination and a concurrent 10 sec tone signals the subsequent delivery of a 0.5 mA shock applied for a maximum of 10 sec. Active avoidance, defined as the crossing into the opposite compartment during the 10 sec conditioning stimuli (light and tone) prevents the delivery of the shock. Crossing over to the other compartment after the delivery of the shock terminates shock delivery and may be recorded as an escape response. If an animal does not leave the conditioning chamber during the delivery of the shock it is recorded as an escape failure. Training can be continued daily until the avoidance of 16 or more shocks out of 20 trials (80% avoidance) on 2 consecutive days is achieved. After this criterion is reached the rats may be given one day of pharmacological testing. On test day, rats can be randomly assigned to experimental groups, weighed and injected intraperitoneally (i.p.) (1 cc tuberculin syringe, 26⅜ gauge needle) or per os (p.o.) (18 gauge feeding needle) with either control or compound solutions. Compounds can be injected at 1.0 ml/kg for i.p. and 10 mL/kg for p.o. administration. Compounds can be administered either acutely or chronically. For testing, each rat may be placed in the shuttle box, and given 20 trials with the same parameters as described above for training trials. The number of avoidances, escapes, and escape failures can be recorded.

Example D PCP-Induced Hyperactivity (PCP-LMA)

Equipment Used: 4×8 home cage photobeam activity system (PAS) frame from San Diego Instruments. Open PAS program and prepare an experimental session using the following variables:

Multiphase experiment

300 sec/interval (5 min)

12 intervals (1 h)

Individual on screen switches.

Start recording after first beam break.

End session after end of interval.

Cage Preparation:

Techniplast™ rat cage with filter top, but no wire lid. Place ˜400 mL bedding and one food pellet in cage and place 250 mL techniplast water bottle in holder on filter top. Place the prepped cage in the PAS frame. Make sure bedding or pellet doesn't block the photobeams.

Animal Preparation:

Mark rats and record their weights. Bring rats to testing room.

Phase I: Habituation

Start the experiment session. Place the rat in the enclosure. The computer should start recording when it detects the rat breaking the beam. The computer will record for 1 h. During the habituation phase, prepare risperidone (positive control): Measure out risperidone, calculate final volume at 1 mg/mL concentration and add 1% glacial acetic acid of the final volume to dissolve risperidone. When risperidone is dissolved, add saline to final volume to make a concentration of 1 mg/mL. Fill syringes (3 mL syringes with 23 g½ needle or oral gavage needle) with Amgen compound solution (5 mL/kg) or risperidone (1 mL syringe with 23 g½ needle) control (1 mL/kg) s.c.

Phase II: Compound Pre-Treatment

Make sure Phase I has ended. Remove rat from enclosure, start the next phase using on-screen individual switch, administer compound p.o or i.p. and control s.c. and place rat back in the enclosure. The computer should start recording when it detects the rat breaking the beam. The computer will record for 1 h.

During phase II, prepare pcp: Dissolve pcp in saline to a concentration of 5 mg/mL.

Fill syringes (1 mL syringes with 26 g⅜ needle) with pcp solution (1 mL/kg).

Phase III: PCP Administration.

Make sure phase II is ended. Remove rat from enclosure, start the next phase using on-screen individual switch, administer pcp s.c. and place rat back in the enclosure. The computer will record for 1 h.

Clean-Up:

End-session to terminate experiment and so that computer will compile data. Export raw data to spreadsheet file for data analysis. Euthanize rats and take necessary tissue/sample for PK.

Data Generation:

Export raw data to spreadsheet file for data analysis. Total time of movement is recorded as the number of photobeam breaks by the computer. Total time of movement (seconds) is combined into 5 minute bins and averaged for each treatment group for an N of 7-10 animals. Data are analyzed for statistical significance using a two-way ANOVA followed by a Bonferroni's post-hoc test for multiple comparisons.

The foregoing is merely illustrative of the invention and is not intended to limit the invention to the disclosed compounds. Variations and changes which are obvious to one skilled in the art are intended to be within the scope and nature of the invention which are defined in the appended claims. All patents, patent applications, and other publications recited herein are hereby incorporated by reference in their entirety. 

What is claimed is:
 1. A compound of formula I:

or a pharmaceutically acceptable salt thereof, wherein the group

 R¹ is C₀₋₄-alk-L¹;  Y is a C₀₋₄alk, —C(═O), SO, or SO₂;  each R² and R³ is independently H, halo, CN, OH, —OC₁₋₄alk, C₁₋₄-alk, C₁₋₄haloalk, —C₁₋₆alkOR^(a), —C(═O)C₁₋₄-alk, —C(═O)NR^(a)R^(a), —C₀₋₄alkNH—C(═O)R^(a), or R^(c);  or alternatively the ring containing X¹, X², X³, X⁴ and X⁵ can be

which is substituted by 0, 1, or 2 R¹⁰ groups;  R^(4a) is H, OH, halo, C₁₋₄-alk, or C₁₋₄haloalk;  R^(4b) is halo, CN, OH, OC₁₋₄alk, C₁₋₄alk, C₁₋₄haloalk, or oxo;  R⁵ is —C₁₋₆alkOR^(a), 5- to 6-membered heteroaryl, fully unsaturated 9- to 10-membered bicyclo-heterocyclic ring, or 11- to 15-membered tricyclo-heterocyclic ring; R⁵ ring is substituted by 0, 1, 2, 3, or 4 R⁸ groups;  m is 0, 1, 2, 3, or 4;  each of p and q is independently 1; wherein the sum of p and q is 2;  R^(a) is independently H or R^(b);  R^(b) is independently phenyl, benzyl, or C₁₋₆alk, wherein said phenyl, benzyl, and C₁₋₆alk are substituted by 0, 1, 2 or 3 substituents which are, independently, halo, C₁₋₄alk, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk;  R^(c) is C₀₋₄alk-L²;  each L¹ is independently a carbon-linked or nitrogen-linked saturated, partially-saturated or fully unsaturated 3-, 4-, 5-, 6-, or 7-membered monocyclic ring or a saturated, partially-saturated or fully unsaturated 6-, 7-, 8-, 9-, 10-, 11-, or 12-membered bicyclic ring, said ring contains 0, 1, 2, 3, or 4 N atoms and 0, 1, or 2 atoms which are O or S; L¹ is independently substituted by 0, 1, 2 or 3 R⁹ groups;  each L² is independently a carbon-linked or nitrogen-linked saturated, partially-saturated or fully unsaturated 3-, 4-, 5-, 6-, or 7-membered monocyclic ring or a saturated, partially-saturated or fully unsaturated 6-, 7-, 8-, 9-, 10-, 11-, or 12-membered bicyclic ring, said ring contains 0, 1, 2, 3, or 4 N atoms and 0, 1, or 2 atoms which are O or S; L² is independently substituted by 0, 1, 2 or 3 R¹¹ groups;  R⁸ is halo, CN, OH, OC₁₋₄alk, C₁₋₄alk, C₁₋₄haloalk, OC₁₋₄haloalk, —C(═O)R^(b), —C(═O)R^(c), —C(═O)NHR^(b), —C(═O)NHR^(c), —S(═O)₂R^(b), —S(═O)₂R^(c), —S(═O)₂NR^(a)R^(a), R^(b), R^(c), NO₂, OR^(b), or OR^(c);  R⁹ is halo, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —C(═O)NR^(a)R^(a), —C(═NR^(a))NR^(a)R^(a), —OC(═O)R^(b), —OC(═O)NR^(a)R^(a), —OC₁₋₆alkNR^(a)R^(a), —OC₁₋₆alkOR^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —S(═O)₂NR^(a)R^(a), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —N(R^(a))C(═O)NR^(a)R^(a), —N(R^(a))C(═NR^(a))NR^(a)R^(a), —N(R^(a))S(═O)₂R^(b), —N(R^(a))S(═O)₂N R^(a)R^(a), —NR^(a)C₁₋₆alkNR^(a)R^(a), —NR^(a)C₁₋₆alkOR^(a), —C₁₋₆alkNR^(a)R^(a), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c); R¹⁰ is oxo, C₁₋₆alk, C₁₋₃haloalk, —OH, —OC₁₋₄alk, —NH₂, —NHC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk; and R¹¹ is halo, C₁₋₆alk, C₁₋₄haloalk, —OR^(a), —OC₁₋₄haloalk, CN, —C(═O)R^(b), —C(═O)OR^(a), —C(═O)NR^(a)R^(a), —C(═NR^(a))NR^(a)R^(a), —OC(═O)R^(b), —OC(═O)NR^(a)R^(a), —OC₁₋₆alkNR^(a)R^(a), —OC₁₋₆alkOR^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —S(═O)₂NR^(a)R^(a), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —N(R^(a))C(═O)NR^(a)R^(a), —N(R^(a))C(═NR^(a))NR^(a)R^(a), —N(R^(a))S(═O)₂R^(b), —N(R^(a))S(═O)₂N R^(a)R^(a), —NR^(a)C₁₋₆alkNR^(a)R^(a), —NR^(a)C₁₋₆alkOR^(a), —C₁₋₆alkNR^(a)R^(a), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), or oxo.
 2. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein the group

substituted by 0, 1, or 2 R¹⁰ groups.
 3. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein m is 1 or
 2. 4. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein L¹ is a carbon-linked-saturated or partially-saturated 3-, 4-, 5-, 6-, or 7-membered monocyclic ring, wherein each said ring contains 0, 1, or 2 N atoms and 0 or 1 O atoms, and wherein each said L¹ is substituted by 0, 1 or 2 R⁹ groups which are F, Cl, Br, C₁₋₆alk, —OR^(a), CN, —C(═O)R^(b), C(═O)OR^(a), —C(═O)NR^(a)R^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O) R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c).
 5. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein L¹ is a carbon-linked-saturated or partially-saturated 5- to 6-membered monocyclic ring, wherein each said ring contains 0, 1, or 2 N atoms and 0 or 1 O atoms, and wherein each said L¹ is substituted by 0, 1 or 2 R⁹ groups which are F, Cl, Br, C₁₋₆alk, —OR^(a), CN, —C(═O)R^(b), C(═O)OR^(a), —C(═O)NR^(a)R^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O) R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c).
 6. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein L¹ is a carbon-linked-fully-unsaturated 5- to 6-membered monocyclic ring, wherein each said ring contains 0, 1, or 2 N atoms and 0 or 1 O atoms, and wherein each said L¹ is substituted by 0, 1 or 2 R⁹ groups which are F, Cl, Br, C₁₋₆alk, —OR^(a), CN, —C(═O)R^(b), C(═O)OR^(a), —C(═O)NR^(a)R^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O) R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c).
 7. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein L¹ is a carbon-linked-saturated, partially-saturated or fully-unsaturated 6-, 7-, 8-, 9-, or 10-membered bicyclic ring, wherein each said ring contains 0, 1, or 2 N atoms and 0 or 1 O atoms, and wherein each said L¹ is substituted by 0, 1 or 2 R⁹ groups which are F, Cl, Br, C₁₋₆alk, —OR^(a), CN, —C(═O)R^(b), —C(═O)OR^(a), —C(═O)NR^(a)R^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c).
 8. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein L¹ is a nitrogen-linked saturated, partially-saturated or fully-unsaturated 4-, 5-, 6-, or 7-membered monocyclic ring, wherein said ring contains 0, 1, 2, 3, or 4 N atoms and 0 or 1 O atoms, and wherein each said L¹ is substituted by 0, 1 or 2 R⁹ groups which are F, Cl, Br, C₁₋₆alk, —OR^(a), CN, —C(═O)R^(b), C(═O)OR^(a), —C(═O)NR^(a)R^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c).
 9. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein L¹ is a nitrogen-linked saturated, partially-saturated or fully-unsaturated 6-, 7-, 8-, 9-, 10-, 11-, or 12-membered bicyclic ring, wherein each said ring contains 0, 1, or 2 N atoms and 0 or 1 O atoms, and wherein each said L¹ is substituted by 0, 1 or 2 R⁹ groups which are F, Cl, Br, C₁₋₆alk, —OR^(a), CN, —C(═O)R^(b), C(═O)OR^(a), —C(═O)NR^(a)R^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c).
 10. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein L¹ is −3-azabicyclo[3.1.0]hexanyl, azetidinyl, indolyl, phenyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, pyrazolyl, piperazinonyl, piperidinyl, pyrrolidinyl, dihydropyranyl, tetrahydropyridinyl, octahydropyrrolo[3,4-c]pyrrolyl, or tetrahydroisoquinolinyl, each of which is substituted by 0, 1 or 2 R⁹ groups which are F, Cl, Br, C₁₋₆alk, —OR^(a), CN, —C(═O)R^(b), C(═O)OR^(a), —C(═O)NR^(a)R^(a), —SR^(a), —S(═O)R^(b), —S(═O)₂R^(b), —NR^(a)R^(a), —N(R^(a))C(═O)R^(b), —N(R^(a))C(═O)OR^(b), —C₁₋₆alkOR^(a), —C₁₋₆alkN(R^(a))C(═O)R^(b), —C₁₋₆alkOC(═O)R^(b), —C₁₋₆alkC(═O)NR^(a)R^(a), —C₁₋₆alkC(═O)OR^(a), oxo, or R^(c).
 11. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein R¹ is:


12. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein R¹ is


13. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein R¹ is:


14. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein each R² and R³ is independently H, F, Cl, Br, CN, OH, OC₁₋₄alk, C₁₋₄alk, or C₁₋₄haloalk.
 15. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein R^(4a) is H, F, OH, or methyl.
 16. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein R^(4b) is oxo and m is
 1. 17. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein R^(4a) is H and m is
 0. 18. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein R⁵ is pyridinyl.
 19. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein R⁵ is fully-unsaturated 9- to 10-membered bicyclo-heterocyclic ring.
 20. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein R⁵ is 11- to 15-membered tricyclo-heterocyclic ring.
 21. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein the group —Y—R⁵ is:

wherein each R⁵ is substituted by 1 or 2 R⁸ groups.
 22. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein the group —Y—R⁵ is:

wherein each R⁵ is substituted by 1 or 2 R⁸ groups.
 23. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein the group —Y—R⁵ is:


24. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein Y is a single bond or —C(═O).
 25. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein Y is a single bond.
 26. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein R⁸ is independently F, Br, C₁, CF₃, methyl, methoxy, or CN.
 27. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein R^(a) is H or C₁₋₆alk substituted by 0 or 1-OH, —OC₁₋₄alk, —OC(═O)C₁₋₄alk, or —N(C₁₋₄alk)C₁₋₄alk.
 28. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein R^(c) is C₀₋₄alk-carbon-linked-saturated, partially-saturated or fully-unsaturated 3-, 4- 5-, or 6-membered monocyclic ring containing 0, 1, or 2 N atoms and 0 or 1 atom which are O or S, each R^(c) is substituted by 0 or 1 R¹¹ groups which are independently F, C₁₋₆alk, C₁₋₄haloalk, or —OR^(a).
 29. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein R^(c) is pyridyl, phenyl, or 1,2,4-oxadiazolyl.
 30. A pharmaceutical composition comprising a compound according to claim 1, or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable excipient.
 31. A compound, or a pharmaceutically acceptable salt thereof, which is: Benzothiazol-2-yl-[3-(3-phenyl-pyrazin-2-yl)-azetidin-1-yl]-methanone; (1H-Benzoimidazol-2-yl)-[3-(3-piperidin-1-yl-quinoxalin-2-yl)-azetidin-1-yl]-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(4-hydroxy-piperidin-1-yl)-quinoxalin-2-yl]-azetidin-1-yl}-methanone; (3-(3-phenylpyrazin-2-yl)azetidin-1-yl)(pyridin-2-yl)methanone; (6-methylpyridin-2-yl)(3-(3-phenylpyrazin-2-yl)azetidin-1-yl)methanone; (3-methylpyridin-2-yl)(3-(3-phenylpyrazin-2-yl)azetidin-1-yl)methanone; (5-methylpyridin-2-yl)(3-(3-phenylpyrazin-2-yl)azetidin-1-yl)methanone; (4-methylpyridin-2-yl)(3-(3-phenylpyrazin-2-yl)azetidin-1-yl)methanone; (1H-Benzoimidazol-2-yl)-[3-(3-phenyl-quinoxalin-2-yl)-azetidin-1-yl]-methanone; (1H-Benzoimidazol-2-yl)-[3-(3-morpholin-4-yl-pyrazin-2-yl)-azetidin-1-yl]-methanone; (1-Methyl-1H-benzoimidazol-2-yl)-[3-(3-phenyl-pyrazin-2-yl)-azetidin-1-yl]-methanone; [3-(3-Phenyl-pyrazin-2-yl)-azetidin-1-yl]-[1-(2,2,2-trifluoro-ethyl)-1H-benzoimidazol-2-yl]-methanone; (1H-Benzoimidazol-2-yl)-[3-(3-phenyl-pyrazin-2-yl)-azetidin-1-yl]-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(3,4-dimethoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(3-isopropyl-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(3-trifluoromethoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; 1H-Benzoimidazol-2-yl)-{3-[3-(3,5-dimethoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(3-ethoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(3-isopropoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(3-fluoro-5-methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(2-methoxy-pyridin-4-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(5-methoxy-pyridin-3-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-benzo[d]imidazol-2-yl)(3-(3-(4-fluoro-3-methylphenyl)pyrazin-2-yl)azetidin-1-yl)methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(4-methoxy-3-methyl-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(3-fluoro-5-methyl-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(5-methyl-pyridin-3-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(4-methyl-thiophen-2-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(1-methyl-1H-pyrazol-4-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(3-hydroxymethyl-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(4-hydroxymethyl-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; 1-(4-{3-[1-(1H-Benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-phenyl)-ethanone; 1-(3-{3-[1-(1H-Benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-phenyl)-ethanone; (1H-Benzoimidazol-2-yl)-{3-[3-(3-methoxymethyl-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; 4-{3-[1-(1H-Benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-N,N-dimethyl-benzamide; 3-{3-[1-(1H-Benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-N,N-dimethyl-benzamide; (1H-benzo[d]imidazol-2-yl)(3-(3-(pyridin-4-yl)pyrazin-2-yl)azetidin-1-yl)methanone; (7-chloro-1H-benzo[d]imidazol-2-yl)(3-(3-(pyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)methanone; (1H-benzo[d]imidazol-2-yl)(3-(3-(2-methylpyridin-4-yl)pyrazin-2-yl)azetidin-1-yl)methanone; (1H-benzo[d]imidazol-2-yl)(3-(3-(m-tolyl)pyrazin-2-yl)azetidin-1-yl)methanone; 3-(3-(1-(1H-benzo[d]imidazole-2-carbonyl)azetidin-3-yl)pyrazin-2-yl)benzonitrile (1-Methyl-1H-benzoimidazol-2-yl)-[3-(3-piperidin-1-yl-pyrazin-2-yl)-azetidin-1-yl]-methanone; {3-[3-(4-Hydroxy-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-(1-methyl-1H-benzoimidazol-2-yl)-methanone; [3-(3-Piperidin-1-yl-pyrazin-2-yl)-azetidin-1-yl]-[1-(2,2,2-trifluoro-ethyl)-1H-benzoimidazol-2-yl]-methanone; {3-[3-(4-Hydroxy-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-[1-(2,2,2-trifluoro-ethyl)-1H-benzoimidazol-2-yl]-methanone; (1H-Benzoimidazol-2-yl)-[3-(3-pyrrolidin-1-yl-pyrazin-2-yl)-azetidin-1-yl]-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(4-trifluoromethyl-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (R)-(1H-Benzoimidazol-2-yl)-{3-[3-(2-methyl-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (S)-(1H-Benzoimidazol-2-yl)-{3-[3-(2-methyl-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(3-methyl-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(4-methyl-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(4,4-dimethyl-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(4-hydroxymethyl-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-(3-{3-[4-(1-hydroxy-1-methyl-ethyl)-piperidin-1-yl]-pyrazin-2-yl}-azetidin-1-yl)-methanone; (1H-Benzoimidazol-2-yl)-(3-{3-[4-(1-hydroxy-1-methyl-ethyl)-piperidin-1-yl]-pyrazin-2-yl}-azetidin-1-yl)-methanone; 1-{3-[1-(1H-Benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-piperidine-4-carbonitrile; (1H-Benzoimidazol-2-yl)-{3-[3-(4-methoxymethyl-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (R)-(1H-Benzoimidazol-2-yl)-{3-[3-(3-methyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (S)-(1H-Benzoimidazol-2-yl)-{3-[3-(3-methyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (R)-(1H-Benzoimidazol-2-yl)-{3-[3-(2-methyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (S)-(1H-Benzoimidazol-2-yl)-{3-[3-(2-methylpyrrolidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(3,4-dihydro-1H-isoquinolin-2-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(1,3-dihydro-isoindol-2-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (R)-(1H-Benzoimidazol-2-yl)-{3-[3-(3-phenyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (S)-(1H-Benzoimidazol-2-yl)-{3-[3-(3-phenyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (R)-(1H-Benzoimidazol-2-yl)-{3-[3-(2-phenyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (S)-(1H-Benzoimidazol-2-yl)-{3-[3-(2-phenyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; 1-{3-[1-(1H-Benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-piperidine-4-carboxylic acid amide; (R)-(1H-Benzoimidazol-2-yl)-{3-[3-(3-hydroxymethyl-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (S)-(1H-Benzoimidazol-2-yl)-{3-[3-(3-hydroxymethyl-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(3-hydroxy-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; [3-(3-Azepan-1-yl-pyrazin-2-yl)-azetidin-1-yl]-(1H-benzoimidazol-2-yl)-methanone; [3-(3-Azetidin-1-yl-pyrazin-2-yl)-azetidin-1-yl]-(1H-benzoimidazol-2-yl)-methanone; (R)-(1H-Benzoimidazol-2-yl)-{3-[3-(2-hydroxymethyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (S)-(1H-Benzoimidazol-2-yl)-{3-[3-(2-hydroxymethylpyrrolidin-1-yl)pyrazin-2-yl]-azetidin-1-yl}methanone; (1H-Benzoimidazol-2-yl)-(3-{3-[4-(2-hydroxy-ethyl)-piperidin-1-yl]-pyrazin-2-yl}-azetidin-1-yl)-methanone; (1H-Benzoimidazol-2-yl)-[3-(3-[1,4]oxazepan-4-yl-pyrazin-2-yl)-azetidin-1-yl]-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(4-methyl-[1,4]diazepan-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; 1-(4-{3-[1-(1H-Benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-[1,4]diazepan-1-yl)-ethanone; (1H-Benzoimidazol-2-yl)-{3-[3-(4-hydroxy-azepan-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (R)-(1H-Benzoimidazol-2-yl)-{3-[3-(3-hydroxymethyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (S)-(1H-Benzoimidazol-2-yl)-{3-[3-(3-hydroxymethyl-pyrrolidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (R)-(1H-Benzoimidazol-2-yl)-{3-[3-(3-hydroxy-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (S)-(1H-Benzoimidazol-2-yl)-{3-[3-(3-hydroxy-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (R)-1-{3-[1-(1H-Benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-piperidine-3-carbonitrile; (S)-1-{3-[1-(1H-Benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-piperidine-3-carbonitrile; 1-{3-[1-(1H-Benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-piperidine-4-carboxylic acid methylamide; 1-(1-(3-(1-(1H-benzo[d]imidazole-2-carbonyl)azetidin-3-yl)pyrazin-2-yl)piperidin-4-yl)ethanone; 1-(4-(3-(1-(1H-benzo[d]imidazole-2-carbonyl)azetidin-3-yl)pyrazin-2-yl)piperazin-1-yl)ethanone; (R)-(1H-benzo[d]imidazol-2-yl)(3-(3-(3-hydroxypyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)methanone; (S)-(1H-benzo[d]imidazol-2-yl)(3-(3-(3-hydroxypyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)methanone; (1H-benzo[d]imidazol-2-yl)(3-(3-(piperidin-1-yl)pyrazin-2-yl)azetidin-1-yl)methanone; (1H-benzo[d]imidazol-2-yl)(3-(3-(4-hydroxypiperidin-1-yl)pyrazin-2-yl)azetidin-1-yl)methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(2-oxa-7-aza-spiro[3.5]non-7-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(2-oxa-6-aza-spiro[3.3]hept-6-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; 1-(6-{3-[1-(1H-Benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-2,6-diaza-spiro[3.3]hept-2-yl)-ethanone; 2-(3-(3-(2-methoxypyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(6-methylpyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(2-methylpyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(6-fluoropyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(6-(trifluoromethyl)pyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(2,6-dimethoxypyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(5-fluoropyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(6-methoxypyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline 2,2,2-trifluoroacetate; 2-(3-(3-(6-fluoro-5-methylpyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline 2,2,2-trifluoroacetate; 2-(3-(3-(pyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline 2,2,2-trifluoroacetate; 2-(3-(3-(4-(methylsulfonyl)phenyl)pyrazin-2-yl)azetidin-1-yl)quinoline 2,2,2-trifluoroacetate; 5-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyridin-2-amine; 5-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyridin-3-amine; 2-(3-(3-(6-methoxypyridin-2-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(2-(trifluoromethyl)pyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline 2,2,2-trifluoroacetate; N,N-dimethyl-5-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrimidin-2-amine 2,2,2-trifluoroacetate; 2-(3-(3-(4-methylpyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline 2,2,2-trifluoroacetate; 2-(3-(3-(5-(methylsulfonyl)pyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline 2,2,2-trifluoroacetate; 2-(3-(3-(5-methylpyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline 2,2,2-trifluoroacetate; 2-(3-(3-(5-methoxypyridin-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline 2,2,2-trifluoroacetate; 2-(3-(3-(4-chloro-3-methylphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-fluoro-4-methylphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-chloro-4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenol; 2-(3-(3-(3-methoxy-5-(trifluoromethyl)phenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(4-ethoxy-3-fluorophenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-chloro-4-ethoxyphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-chloro-4-propoxyphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-fluoro-5-(trifluoromethyl)phenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(4-methoxy-3-methylphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-fluoro-5-isopropoxyphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-fluoro-5-methylphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-chloro-4-fluorophenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3,4-difluorophenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3,4-dichlorophenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3,4-dimethylphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-chloro-4-methylphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-chloro-5-methylphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(4-fluoro-3-methylphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(pyrimidin-5-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(4-chloro-3-(trifluoromethyl)phenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3,6-dihydro-2H-pyran-4-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(2,2-dimethyl-3,6-dihydro-2H-pyran-4-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(6,6-dimethyl-3,6-dihydro-2H-pyran-4-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(1H-pyrazol-4-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-fluoro-5-(trifluoromethyl)phenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(6-methoxypyridin-2-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-phenylpyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(4-methoxyphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(4-fluorophenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(2-fluorophenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-fluorophenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(pyridin-4-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzonitrile; 4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzonitrile; methyl 3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzoate; ethyl 4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzoate; 2-(3-(3-(2-methoxypyridin-4-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(2-fluoropyridin-4-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-(methylthio)phenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 1-(4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenyl)ethanone; 2-(3-(3-(4-phenoxyphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(4-(trifluoromethyl)phenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-fluoro-4-methoxyphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; N,N-dimethyl-3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)aniline; N-methyl-3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzamide; tert-butyl 4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-5,6-dihydropyridine-1(2H)-carboxylate; 2-(3-(3-([1,1′-biphenyl]-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-fluoro-4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzonitrile; 2-fluoro-5-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzonitrile; N,N-dimethyl-3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzamide; 2-(3-(3-(2-methoxyphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-(trifluoromethyl)phenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-ethoxyphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 1-(3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenyl)ethanone; (3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenyl)methanol; 2-(3-(3-(3-(trifluoromethoxy)phenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-(benzyloxy)phenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; N-cyclopropyl-3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzamide; N,N-dimethyl-3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzenesulfonamide; 2-(3-(3-(4-ethoxyphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; (4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenyl)methanol; 2-(3-(3-(4-propylphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(4-ethylphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; N,N-dimethyl-4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)aniline; 2-(3-(3-(4-(trifluoromethoxy)phenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(4-isopropoxyphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-methyl-2-(4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenyl)propanenitrile; 4-((4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenyl)sulfonyl)morpholine; 2-(3-(3-(4-(piperidin-1-ylsulfonyl)phenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; (R)-2-(3-(3-(3-(pyridin-3-yl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (S)-2-(3-(3-(3-(pyridin-3-yl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (R)-2-(3-(3-(3-phenethylpyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (S)-2-(3-(3-(3-phenethylpyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (R)-2-(3-(3-(3-benzylpyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (S)-2-(3-(3-(3-benzylpyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (R)-N,N-dimethyl-1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-amine; (R)-tert-butyl methyl(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate; (S)-tert-butyl methyl(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate; (R)-N,N-dimethyl-1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-amine; (S)-N,N-dimethyl-1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-amine; 2-(3-(3-(3-azabicyclo[3.1.0]hexan-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (R)-2-(3-(3-(3-(phenylsulfonyl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (S)-2-(3-(3-(3-(phenylsulfonyl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (R)-3-methyl-5-(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)-1,2,4-oxadiazole; (S)-3-methyl-5-(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)-1,2,4-oxadiazole; (R)-1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-ol; (R)-2-(3-(3-(3-(pyridin-4-yl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (S)-2-(3-(3-(3-(pyridin-4-yl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (3aR,6aS)-tert-butyl 5-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)hexahydropyrrolo[3,4-c]pyrrole-2(1H)-carboxylate; tert-butyl 5-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)hexahydropyrrolo[3,4-c]pyrrole-2(1H)-carboxylate; tert-butyl 4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-1,4-diazepane-1-carboxylate; (R)-(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)methanol; (R)-2-(3-(3-(3-(methylsulfonyl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (S)-2-(3-(3-(3-(methylsulfonyl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (S)-(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)methanol; (R)-tert-butyl 1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-ylcarbamate; (S)-2-(3-(3-(3-fluoropyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3,3-difluoropyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(4-isopropyl-1,4-diazepan-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (1R,5R)-3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-3-azabicyclo[3.2.2]nonane; 2-(3-(3-(azepan-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(4-methyl-1,4-diazepan-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-3-azabicyclo[3.2.2]nonane; 1-(4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-1,4-diazepan-1-yl)ethanone; (R)-2-(3-(3-(3-phenylpyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (S)-2-(3-(3-(3-phenylpyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (3S,4S)-1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidine-3,4-diol; (1R,4R)-5-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-2-oxa-5-azabicyclo[2.2.1]heptane; (R)-2-(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)thiazole; (S)-2-(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)thiazole; (S)-(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-2-yl)methanol; ((2S,4S)-4-fluoro-1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-2-yl)methanol; (R)-2-(3-(3-(2-(methoxymethyl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(hexahydrocyclopenta[c]pyrrol-2(1H)-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (R)-2-(3-(3-(3-isobutylpyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (S)-2-(3-(3-(3-isobutylpyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3,3-dimethylpyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (R)-2-(3-(3-(3-(methoxymethyl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (S)-2-(3-(3-(3-(methoxymethyl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(4-(trifluoromethyl)piperidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)piperidine-4-carbonitrile; 2-(3-(3-(4,4-difluoropiperidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)morpholine; 2-(3-(3-(4-fluoropiperidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3-methoxyazetidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(3-(3-(3,3-difluoroazetidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 4-methyl-1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)piperidin-4-ol; 1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-1H-pyrazole-4-carbonitrile; 2-(3-(3-(4-methyl-1H-pyrazol-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; tert-butyl (1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)azetidin-3-yl)carbamate; 2,2-dimethyl-4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)morpholine; 2-(3-(3-(4-methyl-1H-imidazol-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 1-(3-(1-(quinazolin-2-yl)azetidin-3-yl)pyrazin-2-yl)piperidine-4-carbonitrile; (1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-1H-pyrazol-4-yl)methanol; (1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-1H-imidazol-4-yl)methanol; 1-methyl-4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)piperazin-2-one; N-(2,6-dimethylphenyl)-1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)piperidine-3-carboxamide; (S)-tert-butyl (1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)piperidin-3-yl)carbamate; (4-(cyclopropylmethyl)-1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)piperidin-4-yl)methanol; 2-(3-(3-((1R,5S)-8-methyl-3,8-diazabicyclo[3.2.1]octan-3-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-amine; (R)-methyl (1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate; (S)-methyl (1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate; (R)-N-(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)methanesulfonamide; (S)-N-(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)methanesulfonamide; (R)-ethyl (1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate; (S)-ethyl (1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate; (R)-2-methoxy-N-(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)acetamide; (S)-2-methoxy-N-(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)acetamide; 2-(3-(3-(1,4-Diazepan-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; Methyl 4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-1,4-diazepane-1-carboxylate; methyl methyl(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate; N-methyl-N-(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)methanesulfonamide; Ethyl methyl(1-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)pyrrolidin-3-yl)carbamate; 2-(3-(3-(4-chlorophenyl)pyrazin-2-yl)azetidin-1-yl)quinazoline; 2-(3-(3-(3-chlorophenyl)pyrazin-2-yl)azetidin-1-yl)quinazoline; 2-(3-(3-(2-chlorophenyl)pyrazin-2-yl)azetidin-1-yl)quinazoline; 2-(3-(3-(o-tolyl)pyrazin-2-yl)azetidin-1-yl)quinazoline; 1-(4-(3-(1-(quinazolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenyl)ethanone; 1-(3-(3-(1-(quinazolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenyl)ethanone; N-(3-(3-(1-(quinazolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenyl)acetamide; N-(4-(3-(1-(quinazolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenyl)methanesulfonamide; N-(3-(3-(1-(quinazolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenyl)methanesulfonamide; 2-(3-(3-(1H-indol-6-yl)pyrazin-2-yl)azetidin-1-yl)quinazoline; 2-(3-(3-(1-methyl-1H-indol-5-yl)pyrazin-2-yl)azetidin-1-yl)quinazoline; 2-(3-(3-(1-methyl-1H-indol-6-yl)pyrazin-2-yl)azetidin-1-yl)quinazoline; 5-(3-(1-(quinazolin-2-yl)azetidin-3-yl)pyrazin-2-yl)indolin-2-one; 1-methyl-5-(3-(1-(quinazolin-2-yl)azetidin-3-yl)pyrazin-2-yl)indolin-2-one; 1-methyl-6-(3-(1-(quinazolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-1H-benzo[d]imidazol-2(3H)-one; 2-fluoro-4-(3-(1-(quinazolin-2-yl)azetidin-3-yl)pyrazin-2-yl)aniline; 2-(3-(3-(p-tolyl)pyrazin-2-yl)azetidin-1-yl)quinazoline; 2-methyl-6-(3-(1-(quinazolin-2-yl)azetidin-3-yl)pyrazin-2-yl)isoquinolin-1 (2H)-one; 2-(3-(3-(1H-indazol-5-yl)pyrazin-2-yl)azetidin-1-yl)quinazoline; 5-(3-(1-(quinazolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzo[d]thiazole; (R)-(1H-Benzoimidazol-2-yl)-(3-{3-[4-(1-hydroxy-ethyl)-phenyl]-pyrazin-2-yl}-azetidin-1-yl)-methanone; (S)-(1H-Benzoimidazol-2-yl)-(3-{3-[4-(1-hydroxy-ethyl)-phenyl]-pyrazin-2-yl}-azetidin-1-yl)-methanone; (R)-(1H-Benzoimidazol-2-yl)-(3-{3-[3-(1-hydroxy-ethyl)-phenyl]-pyrazin-2-yl}-azetidin-1-yl)-methanone; (S)-(1H-Benzoimidazol-2-yl)-(3-{3-[3-(1-hydroxy-ethyl)-phenyl]-pyrazin-2-yl}-azetidin-1-yl)-methanone; (R)-(1H-Benzoimidazol-2-yl)-(3-{3-[4-(1-hydroxy-ethyl)-piperidin-1-yl]-pyrazin-2-yl}-azetidin-1-yl)-methanone; (S)-(1H-Benzoimidazol-2-yl)-(3-{3-[4-(1-hydroxy-ethyl)-piperidin-1-yl]-pyrazin-2-yl}-azetidin-1-yl)-methanone; 1-(4-{3-[1-(1H-Benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-1-yl)-ethanone; 1-{3-[1-(1H-Benzoimidazole-2-carbonyl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-one; (1H-Benzoimidazol-2-yl)-{3-[3-(4,4-difluoro-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(4-hydroxy-4-methyl-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; 2-[3-(3-m-Tolyl-pyrazin-2-yl)-azetidin-1-yl]-quinoline; 2-[3-(3-m-Tolyl-pyrazin-2-yl)-azetidin-1-yl]-quinazoline; 2-[3-(3-m-Tolyl-pyrazin-2-yl)-azetidin-1-yl]-quinoxaline; 2-[3-(3-m-Tolyl-pyrazin-2-yl)-azetidin-1-yl]-benzothiazole; 2-{3-[3-(3-Methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-quinoline; 2-{3-[3-(3-Methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-quinazoline; {1-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-methanol; {1-[3-(1-Quinazolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-methanol; 4-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-phenylamine; {1-[3-(1-Benzothiazol-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-methanol; 1-[3-(1-Benzooxazol-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl-methanol; (1-{3-[1-(5-Methyl-pyridin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-quinoline; (R)-2-(3-(3-(3-methylpyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (S)-2-(3-(3-(3-methylpyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (R)-2-(3-(3-(3-methylpyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (S)-2-(3-(3-(3-methylpyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (R)-2-(3-(3-(3-methylpyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (S)-2-(3-(3-(3-methylpyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; 2-(1-Quinolin-2-yl-azetidin-3-yl)-3-m-tolyl-quinoxaline; 4-[3-(1-Quinolin-2-yl-azetidin-3-yl)-quinoxalin-2-yl]-phenylamine; 3-[3-(1-Quinolin-2-yl-azetidin-3-yl)-quinoxalin-2-yl]-phenol; 2-(3-Methoxy-phenyl)-3-(1-quinolin-2-yl-azetidin-3-yl)-quinoxaline; 2-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-phenol; 3-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-phenol; 4-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-phenol; 2-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-phenylamine; 3-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-phenylamine; 4-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-phenylamine; 2-{3-[3-(4-Fluoro-3-methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-quinoline; 2-Fluoro-4-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-phenylamine; 2-[3-(3-Piperidin-1-yl-pyrazin-2-yl)-azetidin-1-yl]-quinoline; 2-{3-[3-(4-Methyl-piperidin-1-yl)-pyrazin-2-yl]-azetidin-1-yl}-quinoline; 1-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidine-4-carboxylic acid amide; 1-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidine-4-carboxylic acid dimethylamide; 1-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidine-4-carboxylic acid methylamide; 1-[3′-(1-Quinolin-2-yl-azetidin-3-yl)-2,3,5,6-tetrahydro-[1,2]bipyrazinyl-4-yl]-ethanone; 1-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-ol; 2-Methoxy-1-{4-[3-(1-quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-1-yl}-ethanone; 1-{4-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-1-yl}-ethanone; N-{4-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-phenyl}-acetamide; 1-(4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)-5,6-dihydropyridin-1(2H)-yl)ethanone; (R)-1-{1-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-ethanol; (R)-1-{1-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-ethanol; (S)-1-{1-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-ethanol; (R)-1-{1-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-ethanol; (S)-1-{1-[3-(1-Quinolin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-ethanol; 2-fluoro-5-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenol; (1-{3-[1-(6-Methyl-quinolin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-quinoline; (1-{3-[1-(7-Fluoro-quinolin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-quinoline; (1-{3-[1-(6-Fluoro-quinolin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-quinoline; {1-[3-(1-[1,8]Naphthyridin-2-yl-azetidin-3-yl)-pyrazin-2-yl]-piperidin-4-yl}-quinoline; (1-{3-[1-(6-Chloro-quinolin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-quinoline; (1-{3-[1-(6-Chloro-quinoxalin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-quinoline; (1-{3-[1-(6-Methyl-pyridin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-quinoline; (1-{3-[1-(5-Chloro-pyridin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-quinoline; (1-(3-(1-(5-bromopyridin-2-yl)azetidin-3-yl)pyrazin-2-yl)piperidin-4-yl)quinoline; (1-(3-(1-(8-methylquinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)piperidin-4-yl)quinoline; (1-{3-[1-(8-Fluoro-quinolin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-quinoline; (1-(3-(1-(8-chloroquinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)piperidin-4-yl)quinoline; (1-{3-[1-(8-Chloro-quinazolin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-quinoline; (1-{3-[1-(7-Chloro-quinazolin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-quinoline; (1-{3-[1-(6-Chloro-quinazolin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-quinoline; (1-{3-[1-(5-Chloro-quinazolin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-quinoline; (1-{3-[1-(7-Chloro-quinoxalin-2-yl)-azetidin-3-yl]-pyrazin-2-yl}-piperidin-4-yl)-quinoline; 2-[3-(3-Piperidin-1-yl-pyrazin-2-yl)-azetidin-1-yl]-benzothiazole; 2-(3-(3-(3-methoxyphenyl)pyrazin-2-yl)azetidin-1-yl)-8-methylquinoline; 6-Chloro-2-{3-[3-(3-methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-quinazoline; 8-Chloro-2-{3-[3-(3-methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-quinoline; 7-Fluoro-2-{3-[3-(3-methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-quinoline; 2-{3-[3-(3-Methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-6-methyl-quinoline; 2-{3-[3-(3-Methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-[1,8]naphthyridine; 8-Chloro-2-{3-[3-(3-methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-quinazoline; 5-Chloro-2-{3-[3-(3-methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-quinazoline; 2-(3-(3-(3-methoxyphenyl)pyrazin-2-yl)azetidin-1-yl)-4-phenylpyrimidine; 2-(3-(3-(3-methoxyphenyl)pyrazin-2-yl)azetidin-1-yl)benzo[d]thiazole; 6-methoxy-2-(3-(3-(3-methoxyphenyl)pyrazin-2-yl)azetidin-1-yl)benzo[d]thiazole; 2-(3-(3-(3-methoxyphenyl)pyrazin-2-yl)azetidin-1-yl)-1,6-naphthyridine; 6-chloro-2-(3-(3-(3-methoxyphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline; 6-fluoro-2-(3-(3-(3-methoxyphenyl)pyrazin-2-yl)azetidin-1-yl)benzo[d]thiazole; 2-(3-(3-(3-methoxyphenyl)pyrazin-2-yl)azetidin-1-yl)quinoline;-3-carbonitrile; 1-[3-(3-Phenyl-pyrazin-2-yl)-azetidin-1-yl]-phthalazine; 6-chloro-2-(3-(3-phenylpyrazin-2-yl)azetidin-1-yl)-1H-benzo[d]imidazole; 2-(3-(3-phenylpyrazin-2-yl)azetidin-1-yl)-1H-benzo[d]imidazole; 2-((3-(3-phenylpyrazin-2-yl)azetidin-1-yl)methyl)-1H-benzo[d]imidazole; 3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzamide; 4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzamide; 2-fluoro-5-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzamide; 2-fluoro-4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)benzamide; 2-(3-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenyl)propan-2-ol; 2-(4-(3-(1-(quinolin-2-yl)azetidin-3-yl)pyrazin-2-yl)phenyl)propan-2-ol; 2-(3-(3-(1,2,3,6-tetrahydropyridin-4-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; R-2-(3-(3-(3-(pyridin-3-yl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; S-2-(3-(3-(3-(pyridin-3-yl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; R-2-(3-(3-(3-(pyridin-3-yl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; S-2-(3-(3-(3-(pyridin-3-yl)pyrrolidin-1-yl)pyrazin-2-yl)azetidin-1-yl)quinoline; (1H-benzoimidazol-2-yl)-{3-[3-(tetrahydro-pyran-4-yl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (7-Chloro-1H-benzoimidazol-2-yl)-[3-(3-phenyl-pyrazin-2-yl)-azetidin-1-yl]-methanone; (6-Chloro-1H-benzoimidazol-2-yl)-[3-(3-phenyl-pyrazin-2-yl)-azetidin-1-yl]-methanone; (7-Fluoro-1H-benzoimidazol-2-yl)-[3-(3-phenyl-pyrazin-2-yl)-azetidin-1-yl]-methanone; (6-Fluoro-1H-benzoimidazol-2-yl)-[3-(3-phenyl-pyrazin-2-yl)-azetidin-1-yl]-methanone; (6-methyl-1H-benzoimidazol-2-yl)-[3-(3-phenyl-pyrazin-2-yl)-azetidin-1-yl]-methanone; (6-methyl-1H-benzoimidazol-2-yl)-[3-(3-phenyl-pyrazin-2-yl)-azetidin-1-yl]-methanone; (1H-benzoimidazol-2-yl)-{3-[3-(2-methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-benzoimidazol-2-yl)-{3-[3-(3-methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; (1H-Benzoimidazol-2-yl)-{3-[3-(4-methoxy-phenyl)-pyrazin-2-yl]-azetidin-1-yl}-methanone; or 2-(3-(3-(1H-indol-5-yl)pyrazin-2-yl)azetidin-1-yl)quinazoline. 